WTF!! that is the weirdest thing I've ever seen :eek: , its like you have parts of the map missing.. Did this happen before or it started happening recently?
Either there was an error when installing and some of the graphics got screwed up. (SHOULD TRY RE-DOWNLOADING AND RE-INSTALLING) or its your graphic card like Xynh said :rolleyes: . If its none of those you might want to check for viruses and that sort of things just to make sure.
It still seems to me its like windows are poping up or something. I just think something is poping up (or a couple things) and is intefeiring with the screen. It sometimes does that with my media player.