Make sure to run nvidia inspector at admin mode, ie right click the exe and select it in the menu that pops up. thats all i could think would be your problem. make sure you have the most up to date one which is 1.94.
Just a note i had to reengage my sli via nvidia inspector for this aa as it was actually droping below 30 fps mainly in dialogs with one gtx 480. my aa setting is 4x multisampling.
ps this game just keeps getting better and better i cant believe this didnt trump alot of the big hyped up games, this game deserves way more attention.
Jonesy
