I have changed my Radeon 4870 to a GTX285 and since then it Freezes in Fallout 3. when the freeze occurs, the normal ingame music stops and I can't also send Alt-Tab switch to Windows, just stop the graph in frozen state. All ATI remains were manually using Driver Cleaner and clean away, Fallout 3 has been combined with the latest patch installed. As a driver I'm using the current from the nVidia page for Vista x64. Fallout 3 is the only game for the problems, everything else is running perfectly. Any tips?