in the launcher, go to settings, and turn PhysX off. i know that helped out big time with the demo. should do the same for the retail version. as far as drivers
, nVidia has them for 7, so using vista drivers isnt necessary, nor is it recommended.
- also being a graphically intensive game, your card is going to have trouble in any case. my 8500GT had 'hiccups' on the game as well... ( both are budget cards. i would expect great performance to begin with)
-hope it helps.