Disconnect your printer.
Uninstall your printer.
Restart your computer.
Download the current firmware from here
Click on it. It will prompt you when to connect your printer.
I bought a Cannon imageCLASS MF4690 and it seems I can't view the software on os 10.5.2. It seems to install and then after words it does not go into the application folder. I had to map the ip address to the printer to connect to it. It prints right now I just want to get the cannon printer software to work. The software does not work on windows xp or vista.