Try the NHancer program.
http://www.nhancer.com/
It's a free download an solved all my issues caused by the Nvidia drivers.
Oh, the game was incomplete and released prematurely. That's why all the patches were released. Some seem to forget the initial period and the big time issues many had. A lot of folks tried to run this on systems that wre inadequate. It is a demanding program.
Let me know if that fixed what appears to be a GPU problem..
