for me the windows drivers
available were either ip3600 or ip4300, even after running windows update. the canon "add-on" moduile (add on to what?) had no effect. So I just installed my ip4200 using the ip4300 driver
. so far it seems to work.
obviously it would be better if canon just posted a complete new driver for windows 7. Microsoft's win 7 compatibility website claims that the ip4200 is compatible, "no action required." for both 32 and 64-bit.