Nope, Windows XP SP2 and most up to date drivers.

You're suggesting *downgrading* drivers?

I just ran an openGL test, this appears to be a problem with OpenGL games. I still don't know where to go from here though =(

The game is incredibly choppy and tearing.

I'm trying to play the demo from Steam. After installing it and running the game, The game starts up with lots of patterns and broken lines - the game jumps with a vertical sync issue, and fonts/textures are strewn all about. What's going on? I'm using up to date drivers for my card... debug.txt : M...