GameBanshee Forums

That acceleration slider seems to do the same thing as completely disabling the drivers, just it's a lot less hassle. Nice find

Update:

A simpler 'fix' is to go into your device manager and disable your video card driver when you want to play PS:T. Your computer will reset, and when it loads back up it's using the windows default display drivers and the game runs flawlessly.

Then when you're done playing you just go back ...

My system is similar to the one listed in the OP. (7900gt, Opteron 144, WinXP)

Using the lasted NVidia drivers would cause some spell effects to make big blank rectangles appear on the screen. Turning on both Software Blitting and Transperancy would fix the visual artifacts, but make the game run ...