Locate an executable named DelDrvs.exe or CNMFUUN.exe (Canon Driver Uninstaller). Right-click the utility and select .
: The system service managing print jobs is corrupted or stalled.
The Windows Print Spooler service is holding onto a corrupted queue or locking printer ports.
Extract the Canon driver .exe file using a tool like 7-Zip, or look for the extracted folder in your Temp directory. Press Windows Key + X and select . could not install canon mf port monitor
The "Could not install Canon MF Port Monitor" error is a classic sign that your operating system's security settings, corrupted previous installations, or network configurations are preventing a clean printer setup. While the error message can feel dire, it is almost always fixable without needing new hardware.
Strict firewall rules or aggressive antivirus heuristics can block the setup file from executing scripts required to install custom ports. Open your antivirus or Windows Security dashboard. Temporarily disable and the Firewall . Disconnect your printer's USB cable from the PC. Run the Canon driver installer.
The Windows Print Spooler service is frozen or hanging up on a stuck print job. Locate an executable named DelDrvs
If you are trying to set up your Canon imageCLASS printer and hit the error you aren’t alone. This is a common hiccup during the driver installation process on Windows 10 and 11. It essentially means the installer is failing to create the virtual bridge between your computer’s hardware and the printer’s software.
Click and let Windows manually install the basic driver components. Pro-Tips for a Clean Canon Driver Installation
Right-click the icon and look for an option to disable shield protection temporarily (e.g., disable for 10 or 15 minutes). The Windows Print Spooler service is holding onto
Canon’s older MF port monitor uses an unsigned or self-signed kernel-mode driver. Modern Windows blocks these by default.
Select the port and click . (Note: If it says the port is in use, restart your computer and try again). Step 3: Restart the Windows Print Spooler
Are you connecting the printer via or over a Wi-Fi/Ethernet network ?
Re-enable your antivirus immediately after the setup completes. Step 6: Use the Canon MF Driver Uninstaller Utility
If disabling your security software fixes the problem, you know the culprit. The solutions above will help you configure it to allow the installation.
