Modern Windows versions block unsigned drivers for security reasons.
Right-click on the setup.exe or install.exe file and select . canon f91 5800 driver
A: No. Always use Canon’s specific driver for your exact model. Generic drivers (like Microsoft’s built-in) will only allow basic printing, no scanner, no ink monitoring. Modern Windows versions block unsigned drivers for security
Look for regional variations of the Canon site (Canon USA, Canon Europe, or Canon Asia), as legacy documentation and driver files are sometimes hosted exclusively on specific regional servers. 2. Identify the OEM or Alternative Series Names or Canon Asia)