|Try updating the video driver, if that doesn't work, you'll probably need to update the video card. Which card do you have? Is it on the supported list?|
Minimum: Video card (generic): NVIDIA(R) Geforce(TM) 6600 or better or ATI(R) Radeon(R) 9800Pro or better
Recommended: Nvidia Geforce 7800 or better or ATI Radeon X1800 or better. 3.0 Shader Support recommended.