I'm using a built-in video card (laptop), Radeon X1250 I believe. Games worked in XP, but they go all screwy in Win7. TF2, L4D, some other RTS. I'm going to try a quick-fix later today to see if that does anything.
btw, my SteamID is 1up_dave
EDIT: Yeah, the other thing I hate is IE8. Not really a fan of it. But then again, I never really liked IE, even on XP.