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Could Not Install Canon Mf Port Monitor |work| (2024)

Here’s a blog-style post that’s practical, user-friendly, and optimized for someone searching for that exact error.

Last-resort: clean slate and manual port monitor registration

When automated installers refuse to cooperate, manual registration can succeed. The port monitor is typically a DLL that must be registered and its registry entries created. could not install canon mf port monitor

Practical steps (advanced, back up first): Identify the port monitor DLL (e

  • Identify the port monitor DLL (e.g., CNMFMON.DLL or similar) within the Canon driver files.
  • Copy the DLL to C:\Windows\System32 (and SysWOW64 for 32-bit DLLs on 64-bit Windows).
  • Register with regsvr32: regsvr32 /s path\to\dll.
  • Manually create registry entries under Print\Monitors if needed (use exported examples from a working install or Canon documentation).
  • Reboot and start the Print Spooler.

Method 3: Use the Generic "Class Driver"

If you need the printer to work immediately and cannot fix the specific Canon driver error, you can use the built-in Microsoft class driver. Preventing the Error in the Future

  1. Plug the printer in via USB.
  2. Open Device Manager (Right-click Start button > Device Manager).
  3. Look for your printer. It might be under "Other devices" with a yellow exclamation mark, or under "Printers."
  4. Right-click it and select Update driver.
  5. Select "Browse my computer for drivers".
  6. Select "Let me pick from a list of available drivers on my computer".
  7. Select Canon from the manufacturer list on the left.
  8. On the right, look for a generic driver like Canon Generic Plus PCL6 or Canon MF Series.
  9. Select it and click Next. Windows will install the core printing function without the specific "Port Monitor" software.

Method 5: Disable Driver Signature Enforcement (Windows 10/11)

Canon’s older MF port monitor uses an unsigned or self-signed kernel-mode driver. Modern Windows blocks these by default.

  1. Hold Shift while clicking Restart from the Start menu.
  2. After reboot, choose Troubleshoot > Advanced Options > Startup Settings > Restart.
  3. Press F7 (Disable driver signature enforcement).
  4. Once Windows boots, install the Canon driver immediately.
  5. Note: This is temporary; the setting resets on next normal reboot.

Fix 3: Install in Clean Boot State

Background applications (especially printer utilities from other brands like HP or Epson) can conflict with Canon’s port monitor.

Steps to perform a Clean Boot:

  1. Press Windows + R, type msconfig, and press Enter.
  2. Go to the Services tab.
  3. Check Hide all Microsoft services, then click Disable all.
  4. Go to the Startup tab and click Open Task Manager.
  5. Disable all startup items.
  6. Restart your PC.
  7. Install the Canon driver as administrator.
  8. Re-enable your services via msconfig after the fix.

Preventing the Error in the Future

  • Always uninstall old Canon drivers before upgrading.
  • Temporarily disable antivirus during printer installation.
  • Download drivers directly from Canon — not from third-party sites.
  • On Windows 11/10, prefer the .inf driver over the full software suite if you just need printing.
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