You may want to try a few things before you reinstall your video drivers... Go in to the display control panel, and look at the advanced tab. (Or it may be "settings"... no OS specified) you're looking for "Hardware acceleration" When you find it, reduce it a notch until either the problem goes away or you run out of notches.
If you run out of notches, you may have to reinstall your video drivers.
Unsolved 
