Pretty sure I keep coming back to the same thing, your driver.
Try this one: -
http://www.nvidia.com/object/win7-winvi ... river.html
Considering the lack of the wealth of information it is extremely difficult to diagnose. You say this game did work on this computer, and now it does not; pray tell what happened between the time it was working to when it was not.
Also, are you still running the game as Admin?
Try this one: -
http://www.nvidia.com/object/win7-winvi ... river.html
Considering the lack of the wealth of information it is extremely difficult to diagnose. You say this game did work on this computer, and now it does not; pray tell what happened between the time it was working to when it was not.
Also, are you still running the game as Admin?