I believe this could be fixed simply by updating your graphics card drivers.
E.g., if you\'re using an nvidia card, download the latest drivers from
nvidia.com. If you\'re using ATI, the recommended drivers are
Omega (you can alternatively try
ati.com). Basically find your card model, and download the drivers from the manufacturer\'s website. They\'re free updates :)
Make sure you are downloading the correct drivers, however! For some reason, a few individuals owning one certain model decided to download drivers for a completely different brand. Be sure you know which ones you need.