Print Screen just gives me a black box, not a good indicator. If I were to describe it in more detail, I would say the textures aren't loading, only the models are there. The only texture visible is the sky, and that is with fillrate at 200% and everything at very high. Could it possibly be that I'm using the 190 beta driver from nvidia? I tried the demo with the 186 version and was still getting the same graphical errors.
What res are you running? Also, try screenshots with fraps or x-fire.