Finally, can cause this issue. Antivirus programs or firewalls often monitor system changes to prevent malware. They may falsely flag the Canon driver's attempt to install a new Port Monitor DLL as suspicious activity and block the "exclusive" write access required to complete the installation.
The error message generally signals a conflict between the printer's driver installation package and the Windows printing subsystem, often stemming from insufficient administrative permissions or leftover port configurations from previous installations. Understanding the Error could not install canon mf port monitor exclusive