I'm having the same issue as everyone else- my canon mp500 prints and copies, but gets errors when trying to scan. Just spent an hour with canon tech support (2nd time, tried six months ago too) and they say it's microsoft's problem. I don't think so, though, seems to be a driver issue. I'm also going to try to find some twain drivers for windows 7 see if that works.
Canoscan 9950F Driver Windows 7
DOWNLOAD: https://urlin.us/2vETLm
2ff7e9595c