I agree, use Nvidia's detonator drivers 2.8
I use them and increased frame rates about 20 percent.
Also when in windows, hit ctrl,alt,and delete and see how many programs you have running before starting any game. You should have only systray and explorer running on the computer, and nothing else.
If you see alot of programs, it uses up your resources making your computer slow down. I dodn't know how many programs are started up, but I do know that if you have alot of em running in the background, its a hit on frame rate. Try it! you'll like it
Cya USA!!!!
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USA