Nope it is not the drivers i have the latest drivers instaled for My ati 5970card 11.2 to be precise and i have win7. I had the same problem with the first game with another computer and that dident help then either. I found a solution on the forum for that game and then it worked, and now i have EXACTLY the same problem but with a better computer and i can for f**ks sake play crysis 2 without problem. And it is a clean instalation of the drivers.
11.3 are the latest drivers released 2 days ago.
Did you try to reinstall the game? And does the fix which worked on Shift work on Shift 2?
If we don't end war,
war will end us