First at all , latest dont nessesery means better. some time ago i had problems with new drivers so i downgraded, my current drivers are 6.14.11.9062, from 17.8.2009. not running any antivirus software. didnt expirieced single crash, with exeption few times becouse lack of memory (i have page file turned off).
i would suggest try also downupgrade drives, and stop your VA software for a while and try it, its known AV can couse problems with some software, and in some combination even lead to BSOD.
Also if you check over the net, a lot ppls have problems with VC drivers crashing in different games with windows 7, altho never had need to look for solution, but there might be one around.
( did your screen go black for several seconds from time to time ? that usualy means drivers crashed, but windows could recover from error and restarted them )