After some time of playing, (around 5 minutes in the game usually) the game freezes and an error appears saying "VPU Recover has reset your graphics accelerator". I can keep playing for a bit, but it keeps freezing and eventually crashes. So, anyway my graphics card is ATI Mobility HD 3450.

I know, you'll be saying that it's a driver problem. The card didn't have official drivers for XP, so I used Mobility Modder to get that stuff working, so getting other driver is out of question. Besides, with the official driver on Vista I had the same problem.

Can somebody help me out here? Maybe I have to change some setting in Catalyst or something.