Mastercam+x72022+virtual+usb+bus+error+39+fixed [2021] Link

While there isn't a single formal academic "paper" on this specific error, the Virtual USB Bus Error 39 in Mastercam (often occurring in versions like X7 through 2022) is a well-documented driver signature and registry issue. It typically happens when the operating system (usually Windows 10 or 11) blocks the virtual USB emulator driver because it lacks a valid digital signature or has corrupted registry entries. Understanding the "Error 39"

The Windows Device Manager reports Error 39 when it "cannot load the device driver for this hardware... the driver may be corrupted or missing." In the context of Mastercam emulators, this usually means Core Isolation or Windows Driver Signature Enforcement is blocking the unsigned virtual bus. Step-by-Step Fixes

Based on common technical resolutions, here is how this is typically fixed:

Disable Memory Integrity (Core Isolation): This is the most common culprit in newer Windows versions.

Go to Windows Security > Device Security > Core isolation details. Toggle Memory integrity to Off. Restart your computer.

Disable Driver Signature Enforcement: If the driver is unsigned, Windows will block it by default. Hold Shift while clicking Restart.

Navigate to Troubleshoot > Advanced options > Startup Settings > Restart. Press 7 or F7 to "Disable driver signature enforcement." Registry UpperFilters/LowerFilters Removal:

Open regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000. Look for UpperFilters or LowerFilters in the right pane.

Delete these entries and restart. (Warning: Back up your registry first).

Update the Virtual Bus Driver: Manually point the Device Manager to the mcamusb.inf file found within your Mastercam installation directory or the specific emulator folder to "Update Driver." Community Insights

Technical users often find that Windows updates silently re-enable security features that break these virtual drivers.

"The issue is almost always Windows 10/11 security. If you don't turn off Memory Integrity in the Windows Defender settings, the virtual bus will never start, no matter how many times you reinstall it."

"Check your Device Manager. If you see the yellow triangle with Error 39, it's a signature issue. Disabling driver enforcement during boot usually clears it right up."

The "Code 39" error for the Mastercam Virtual USB Bus (often associated with MultiKey or HASP emulators) typically indicates that Windows cannot load the driver because it is either corrupted, missing, or blocked by security features. This issue is common in Windows 10 and 11 environments due to increased security around unsigned or third-party drivers. Primary Cause: Core Isolation (Memory Integrity)

The most frequent cause of Code 39 for virtual drivers in modern Windows is Core Isolation , specifically the Memory Integrity

setting. This feature prevents drivers that do not meet strict security standards from loading. Matsusada Precision How to Fix Windows Security from the Start menu. Navigate to Device Security Core isolation details Memory integrity Restart your computer to apply the changes. Matsusada Precision Alternative Solution: Registry Modification

If the error persists or you cannot access security settings, you can manually disable the integrity check via the Registry Editor. Registry Path

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity : Find the value and set it to Legacy Fix : Some users resolve Code 39 by deleting UpperFilters LowerFilters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 if they exist. Driver Reinstallation Steps

This text appears to be a search query or a file name, likely related to software troubleshooting or piracy. It suggests a user is looking for a solution to a specific technical error within the Mastercam X7 2022 software.

Here is a breakdown of the components:

Context: The combination of these terms strongly suggests this is related to cracked software. Legitimate users experiencing a driver error would usually contact the software vendor (CNC Software) or reinstall the official dongle drivers (like the Sentinel Driver). The search for a "fixed" file usually implies bypassing the security check that is causing the virtual bus error.

Safety Warning: If you found a file with this name or are considering downloading a "fix" for this error:

  1. Malware Risk: Files claiming to fix DRM or dongle errors are a common vector for trojans and malware.
  2. Stability: Modifying system bus drivers to bypass security can cause system instability or affect other USB devices.
  3. Legality: Using software bypasses violates the software's End User License Agreement (EULA) and copyright laws.

Introduction

Mastercam X7 2022 is a popular computer-aided manufacturing (CAM) software used for CNC machining. However, some users have reported encountering a "Virtual USB Bus Error 39" issue while trying to use the software. This error can be frustrating and prevent you from using the software effectively. In this guide, we will walk you through the steps to fix this error.

What is Virtual USB Bus Error 39?

The Virtual USB Bus Error 39 is a common error that occurs when the Mastercam X7 2022 software is unable to communicate with the USB dongle (also known as a hardware key or license key). The dongle is a small device that plugs into your computer's USB port and is used to authenticate the software license.

Causes of Virtual USB Bus Error 39

The error can be caused by a variety of factors, including:

  1. Faulty USB dongle: The dongle may be damaged or malfunctioning.
  2. USB port issues: The USB port may be faulty or not functioning correctly.
  3. Driver problems: Outdated or corrupted drivers may be preventing the software from communicating with the dongle.
  4. Conflicting software: Other software may be interfering with the Mastercam X7 2022 software.
  5. Windows registry issues: Registry entries may be corrupted or incorrect.

Step-by-Step Solution

To fix the Virtual USB Bus Error 39, follow these steps:

Step 1: Troubleshoot the USB Dongle

  1. Try using a different USB port on your computer.
  2. Check the dongle for physical damage.
  3. If possible, try using a different dongle.

Step 2: Update Drivers

  1. Go to the Device Manager (Windows key + X and select Device Manager).
  2. Expand the "Universal Serial Bus controllers" section.
  3. Right-click on each USB Root Hub and select "Update driver".
  4. Follow the prompts to search for and install updated drivers.

Step 3: Disable Conflicting Software

  1. Close all unnecessary programs and background applications.
  2. Check for any antivirus software that may be interfering with the Mastercam X7 2022 software.
  3. Temporarily disable any firewall or antivirus software.

Step 4: Clean the Windows Registry

  1. Open the Registry Editor (Windows key + R, type "regedit", and press Enter).
  2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\a45c254e-df1c-4efd-8020-67d146a850e0\####\Device Parameters
  3. Look for any entries with a " USB" or "Virtual" keyword.
  4. Delete any entries that seem suspicious or unnecessary.

Step 5: Reinstall Mastercam X7 2022

  1. Uninstall the Mastercam X7 2022 software.
  2. Reinstall the software from the original installation media or download.

Step 6: Apply the Fix

  1. Download and install the Mastercam X7 2022 patch from the official CNC Software website.
  2. Follow the prompts to apply the patch.

Verification

After completing these steps, start Mastercam X7 2022 and verify that the Virtual USB Bus Error 39 is resolved. If you still encounter the error, you may want to contact CNC Software support or a qualified technical support specialist for further assistance.

Conclusion

The "Code 39" error for the Mastercam Virtual USB Bus (often associated with

emulators) typically occurs because newer Windows security features block older, unsigned drivers. Primary Fix: Disable Memory Integrity In Windows 10 and 11, the Core Isolation

feature prevents drivers from loading if they do not meet specific security requirements, resulting in a Code 39 error. Matsusada Precision Start menu and search for "Windows Security" Navigate to Device Security Core isolation details Memory integrity Restart your computer for the changes to take effect. Alternative Fix: Clear Registry Filters

If disabling Core Isolation doesn't work, corrupted registry values may be blocking the virtual bus. , and run it as an administrator. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Locate the key: 36FC9E60-C465-11CF-8056-444553540000 (this is the USB Class key). In the right pane, look for UpperFilters LowerFilters . Right-click and Restart your PC Advanced Troubleshooting Driver Reinstallation Device Manager

, find the Virtual USB Bus with the yellow exclamation mark, right-click, and select Uninstall device

. Restart your PC to let Windows attempt a clean re-detection. User Profile Corruption : Some Mastercam users report that a corrupted Windows User profile

can cause persistent virtual USB errors; creating a new local user account may resolve the issue. Driver Signature Enforcement : For older versions like X7, you may need to permanently disable driver signature enforcement

via the advanced startup menu to allow the virtual driver to load. Google Groups If you'd like, I can help you: exact registry path for your specific Mastercam version. Guide you through disabling Driver Signature Enforcement Troubleshoot Sentinel/HASP driver conflicts. Let me know which Windows version you are currently running. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

Mastercam users transitioning from older versions like X7 to modern releases like 2022 often encounter the frustrating "Virtual USB Bus Error 39". This error typically presents as a yellow exclamation mark in the Device Manager next to the "Virtual USB MultiKey" or "Sentinel" driver, preventing the software from detecting the necessary security dongle.

The core issue is that Windows 10 and 11 have stricter security protocols—specifically Core Isolation (Memory Integrity) and Driver Signature Enforcement—which block older virtual USB bus drivers from loading.

Here is the comprehensive guide to fixing Mastercam Virtual USB Bus Error 39. Phase 1: Disable Windows Core Isolation (Primary Fix)

Modern Windows security features can block third-party virtual drivers. This is the most common cause of Error 39.

Open Windows Security: Click the Start menu, type "Windows Security," and open it.

Navigate to Device Security: Select Device security on the left sidebar. Core Isolation Details: Click on Core isolation details.

Toggle Memory Integrity Off: Find the "Memory integrity" switch and turn it Off.

Restart Your PC: You must restart your computer for these changes to take effect. Phase 2: Disable Driver Signature Enforcement

If the error persists after disabling Core Isolation, Windows may still be blocking the driver because it isn't digitally signed for the current OS version. Hold the Shift key and click Restart from the Start menu.

Go to Troubleshoot > Advanced options > Startup Settings > Restart.

After the PC restarts, press 7 or F7 to select "Disable driver signature enforcement".

Once Windows boots, check the Device Manager to see if the Virtual USB Bus is now active. Phase 3: Registry Editor Fix (Removing UpperFilters)

Corrupted registry entries can prevent the USB bus driver from initializing correctly. How to Fix USB Driver Error Code 39 - Matsusada Precision

The Virtual USB Bus Error 39 in Mastercam (typically versions X7 through 2022) is a common driver signature or compatibility issue. It occurs because Windows cannot load the virtual device driver required for the software's emulator (often used for bypasses or specific hardware keys) because it isn't digitally signed or is being blocked by security features. Core Causes of Error 39

Driver Signature Enforcement: Windows 10 and 11 block drivers that aren't verified by Microsoft.

Memory Integrity (HVCI): A Windows Security feature that prevents "untrusted" drivers from loading into high-security memory.

Corrupt Registry Entries: Leftover keys from previous installations or failed emulator setups. Step-by-Step Solutions 1. Disable Windows Driver Signature Enforcement

This is the most common fix for Error 39. Windows requires a special boot mode to allow these virtual drivers to load. Click Start > Settings > Update & Security > Recovery. Under Advanced startup, click Restart now.

Once the PC restarts, navigate to: Troubleshoot > Advanced options > Startup Settings > Restart.

After restarting again, a list of options will appear. Press 7 or F7 to Disable driver signature enforcement.

Once Windows boots, try reinstalling the virtual USB driver or launching Mastercam. 2. Turn Off Memory Integrity (Core Isolation)

Modern Windows security often blocks virtual USB emulators even if signature enforcement is off. Open Windows Security (search for it in the Start menu). Go to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your computer. 3. Update or Reinstall the MultiKey/Emulator Driver

If the driver itself is outdated, it will trigger Error 39 regardless of settings. Open Device Manager (Right-click Start > Device Manager).

Look for Universal Serial Bus controllers or System devices.

Locate the "Virtual USB Bus" or "MultiKey" entry with the yellow exclamation mark.

Right-click it, select Uninstall device, and check "Delete the driver software for this device."

Run your emulator setup script (usually install.bat or setup.exe provided with your specific version) as an Administrator. 4. Registry Cleanup mastercam+x72022+virtual+usb+bus+error+39+fixed

If the error persists, old registry keys might be pointing to the wrong driver path. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MultiKey (or the specific emulator key). Ensure the paths match your current installation directory.

Note: Always back up your registry before making manual changes. Verification

After applying these fixes, check the Device Manager again. The "Virtual USB Bus" should appear under "System devices" or "USB controllers" without any warning icons.

How to Fix Mastercam Virtual USB Bus Error Code 39 (X7–2022) Encountering the Virtual USB Bus Error 39

in Mastercam (X7 through 2022 versions) can bring your production to a standstill. This error typically signifies that Windows cannot load the device driver because it is either corrupted or missing. Frequently, it is caused by modern Windows security features or registry conflicts.

Below is a comprehensive guide to resolving this error and getting your HASP back online. 1. Disable Core Isolation (Memory Integrity)

The most common cause of Error 39 on Windows 10 and 11 is a security feature called Core Isolation

. This feature often blocks older or virtual drivers from loading. Open Windows Security Privacy & Security (Windows 11) or Update & Security (Windows 10). Navigate to Device Security Windows Security Device Security Modify Core Isolation : Click on Core isolation details Turn Off Memory Integrity : Toggle the switch for Memory integrity Restart Your PC : You must reboot for these changes to take effect. 2. Delete Registry UpperFilters and LowerFilters

If the error persists, there may be corrupted registry entries in the USB controller class that prevent drivers from initializing. , and hit Enter to open the Registry Editor Navigate to the following path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right-side pane, look for UpperFilters LowerFilters Right-click and these values. Restart your computer to allow Windows to rebuild these filters. 3. Reinstall Virtual USB MultiKey Drivers

In some cases, the virtual bus driver itself needs a fresh installation or an updated file set to match modern Windows security standards. Remove Existing Drivers

: Go to your Mastercam installation or MultiKey folder and run the remove.cmd remove.bat file as an administrator. Update Driver Files : Some users find success by replacing older

files in the MultiKey folder with updated versions designed for Windows 10/11. install.cmd

file as an administrator. When the Windows Security prompt appears, select Install this driver software anyway 4. Advanced Troubleshooting Tips Change USB Ports

: Sometimes simply moving the physical HASP to a different USB port can trigger a driver refresh. Disable Hypervisor-Enforced Code Integrity : In the Registry Editor, navigate to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity and set the Check Antivirus

: Ensure your antivirus software isn't quarantining critical Mastercam or HASP driver files.

For more specific driver downloads, always refer to official sources like the Sentinel/SafeNet Support Page or contact your Mastercam Reseller for verified driver packages. Are you using a physical HASP virtual emulator , and did you recently install any Windows Updates Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The Mastercam Virtual USB Bus Error 39 is a common hardware driver issue that prevents the software's licensing dongle (HASP/HLK) from communicating with Windows. The error message typically states that the "driver may be corrupted or missing," but in modern systems, it is frequently caused by advanced security features blocking the emulator or driver. Core Causes of Error 39

Memory Integrity (Core Isolation): This is the most frequent culprit on Windows 10 and 11. This security feature prevents unsigned or legacy drivers from loading into high-security memory zones.

Corrupted Registry Entries: Leftover "UpperFilters" or "LowerFilters" in the Windows Registry can cause universal serial bus (USB) controllers to fail.

Outdated Drivers: Using legacy drivers for Mastercam versions like X7 on modern operating systems often leads to compatibility conflicts. Proven Fixes for Mastercam X7–2022 1. Disable Core Isolation (Recommended)

If you are using a virtual USB bus or an older dongle, Windows Security may be blocking it. Open Windows Security and navigate to Device Security.

Select Core isolation details and toggle Memory integrity to Off.

Restart your computer and check the Device Manager to see if the error has cleared. 2. Registry Correction (Advanced)

If disabling Core Isolation doesn't work, you may need to clear corrupted filters in the Registry.

Open regedit and navigate to the class GUID for USB controllers:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000

Locate and delete the UpperFilters or LowerFilters values in the right-hand pane. Restart the system. 3. Clean Driver Reinstallation

A standard reinstall often fails because it leaves behind corrupted files.

Go to Device Manager, right-click the item with the yellow exclamation mark (usually under "Universal Serial Bus controllers"), and select Uninstall device.

Download the latest Sentinel HASP/LDK drivers directly from the Thales Customer Support Portal or the official Mastercam downloads page to ensure compatibility with Windows 10/11. 4. User Profile Corruption

In some enterprise environments, the error may stem from a corrupt Windows User profile. Users have found that deleting and recreating the local Windows profile can resolve persistent Mastercam launch failures that hardware fixes could not address. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Error Code 39" in Mastercam (typically related to the Virtual USB MultiKey or HASP drivers) usually indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked by security features. This is a common issue on Windows 10 and 11 due to enhanced security protocols like Memory Integrity. Core Solutions to Fix Error 39

The most effective fix for this specific Mastercam error involves adjusting Windows security settings or cleaning up registry filters. 1. Disable Core Isolation (Memory Integrity)

This is the most frequent cause for Virtual USB drivers failing to load. Windows security blocks drivers it deems "incompatible" with memory protection. Open the Start menu and search for Windows Security. Navigate to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your PC for the changes to take effect. 2. Delete Upper/Lower Filters in Registry

If the driver itself is corrupted, Windows may have "stuck" filters in the registry preventing proper communication. While there isn't a single formal academic "paper"

Press Win + R, type regedit, and hit Enter to open the Registry Editor.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the standard class for USB controllers).

In the right pane, look for UpperFilters and LowerFilters. If they exist, right-click and Delete them. Restart your computer. 3. Reinstall Virtual USB / HASP Drivers How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

Title: How I Fixed the Mastercam + X7 2022 "Virtual USB Bus Error 39" (Step-by-Step) Tags: Mastercam, X7 2022, Error 39, Virtual USB, NetHASP, CAD/CAM Fix

The Frustration is Real

There is nothing worse than sitting down to hit a deadline, firing up Mastercam (X7 or 2022), and being greeted by the dreaded Error 39:

"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)"

If you are using a Virtual USB Bus emulator for your NetHASP (often for legacy licensing or hardware replacement), this error effectively bricks your software. Device Manager shows that yellow exclamation mark, and Mastercam refuses to see the license.

After two days of trial and error, I finally fixed it. Here is exactly how.

When to contact support (what to provide)

Method 2: Manual Driver Re-installation (The Permanent Fix)

This forces Windows to accept the virtual USB driver.

  1. Uninstall the broken device:

    • Open Device Manager.
    • Find the yellow triangle under Universal Serial Bus controllers (Often named "Virtual USB Bus" or "HASP Key").
    • Right-click > Uninstall device. Check "Delete the driver software" if available.

  2. Remove leftover certificates:

    • Open regedit (Registry Editor).
    • Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Certificates
    • Delete the F750E6C3-38EE-11D1-85E5-00C04FC295EE folder. (Back up first!).

  3. Reinstall in Test Mode:

    • Open Command Prompt as Administrator.
    • Type: bcdedit /set testsigning on and press Enter. Restart.
    • You will see "Test Mode" in the corner of your screen. Windows now allows the old driver.
    • Run your Virtual USB installer (or install.cmd for the emulator).
    • Go back to Device Manager > Action > Scan for hardware changes. The error should be gone.

Step 2: The Standard Driver Reinstallation (Often Fails But Required)

Many online guides stop here. We include it for completeness.

  1. Open Device Manager (Win+X → M).
  2. Expand System devices.
  3. Right-click Virtual USB Bus (with yellow exclamation) → Uninstall device.
    • Check “Delete the driver software for this device” if available.
  4. Reboot your PC.
  5. Reinstall the specific Mastercam driver package for your version:
    • For Mastercam X7–X9: HASPUserSetup.exe (v7.50 or earlier)
    • For Mastercam 2017–2022: HASPUserSetup.exe (v7.90 or later)

Result after reboot? If Error 39 persists, proceed.

Phase 5: Reconfigure Mastercam License Manager

  1. Open NHASPX.exe (NetHASP License Manager) as Admin.
  2. Go to Diagnostics → Run Diagnostics.
  3. If the Virtual Bus appears green, click Update.
  4. Set environment variable if needed: 
    setx NHASP_REDIRECT "auto"

The Ghost in the Machine: Mastercam, the Virtual Bus, and Error 39

How to Fix "Error 39" for Mastercam Virtual USB

There are two main methods to resolve this, depending on your Windows version (Windows 7 vs. Windows 10/11).

1. Uninstall the broken driver

Final Verdict

Error 39 is not a hardware failure; it is a Windows driver policy conflict. While Mastercam 2022 is technically compatible with Windows 11, its legacy Virtual USB Bus driver is not. By forcing the driver through disabled signature enforcement and scrubbing corrupted registry filters, you can restore full functionality.

If you’ve followed this 2000-word guide and still see the yellow bang, your only recourse is to either downgrade to Windows 10 21H2 (and block updates permanently) or upgrade to Mastercam 2024 (which uses a newer licensing system). However, for 95% of users, the steps above will bring your CNC workstation back to life.

Have you fixed your Error 39? Share which step worked for you in the comments below. Keep making chips.

Disclaimer: This guide is for troubleshooting legacy licensed software. Always ensure you are compliant with Mastercam’s EULA regarding virtual devices.

The Virtual USB Bus Error 39 in Mastercam (versions X7 through 2022) typically occurs when Windows prevents a third-party driver, such as the MultiKey or HASP emulator, from loading due to security restrictions or registry corruption. Below are the standard methods to resolve this error: 1. Disable Core Isolation (Memory Integrity)

The most common cause of Error 39 on Windows 10 and 11 is the Core Isolation feature, which blocks drivers that don't meet specific security standards.

Open the Start menu, search for Windows Security, and open it. Go to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your computer to apply the changes. 2. Remove Registry UpperFilters and LowerFilters

Corrupted registry entries for USB classes can cause driver load failures. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

Fixing the Mastercam X7 to 2022 Virtual USB Bus Error 39 typically requires disabling the Windows Core Isolation (Memory Integrity) security feature, which often blocks the specialized drivers used for HASP keys or virtual USB emulators. Direct Solutions for Error 39 1. Disable Core Isolation (Recommended)

This is the most frequent fix for modern Windows 10 and 11 systems where security features prevent the Virtual USB Bus driver from loading.

For Windows 11: Go to Settings > Privacy & security > Windows Security > Device security.

For Windows 10: Go to Settings > Update & Security > Windows Security > Device Security.

Click Core isolation details and toggle Memory integrity to Off. Restart your computer for changes to take effect. 2. Clean Driver Reinstallation

If disabling security doesn't work, the driver files may be corrupted. Open Device Manager (Win + X). Expand Universal Serial Bus controllers.

Right-click the "Virtual USB Bus" or "HASP" device with the yellow exclamation mark and select Uninstall device.

Check the box for Delete the driver software for this device.

Download and install the latest HASP drivers from official support sites like Thales Customer Support. 3. Registry Editor Fix (UpperFilters/LowerFilters)

If the system still fails to load the driver, you may need to clear corrupted filter entries in the registry. Press Win + R, type regedit, and press Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the class for USB controllers).

In the right pane, look for UpperFilters or LowerFilters and Delete them. Restart your computer. Troubleshooting Additional Causes Mastercam USB HASP issue - eMastercam.com