I just got the game but everytime i run it i have a problem with line running through the screen. For example a tree shadow will run across the screen, making it impossible to see whats underneath it. I've lowered all texture qualities and resolutions and i continue to have the problem.
Radeon Pro 9000 (128 MB) AMD Athelon 1.2 GB Windows XP Pro
Do you have the latest drivers for your video card? Also, what direct x do you have? Try updating both of those and see if that helps.