I tried out the Psychonauts demo a few weeks ago and liked it enough to get the full game. The demo ran with no probem. The game ran fine too, for a few days, until I downloaded the latest patch. Ever since I am getting sudden frame rate slowdowns during play- from the normal 25-30 fps (measured with Fraps) to 5 fps. This happens randomly, even if the screen character is not moving. After a minute or to the framerate goes back to normal. Aha, I thought, must be the fault of the patch. So I uninstalled the game and reinstalled it without the patch. Same problem! I tried updating video drivers, defragging the drive, stopped running programs with Enditall, nothing has helped. No other games seem to be affected. Anyone else see this problem?

My system:
Athlon XP 3000+
Geforce FX5700 Ultra, 81.85 driver (the latest)
768 mb ram