RADEON X800 series, moniter spuares

I'm having a problem where when i do certain things little squares will start flickering over the entire moniter. It will happen if i leave open the World of Warcraft loggin screen for to long ( about 4 or 5min, i have to minimize when im stuck in a queue ), but once i load into the game the problem wont occure. It also happens when i play Neverwinter nights, happens every time on this game however after a small amount of time.

I havn't tried any of my other games yet because im afraid this problem will accure and the game will just be taking up space cause i cant play it.

I tried updating my driver several times and had no succes. If u have any info. that could help me out plz post it.

Woot, no more squares =D, thanks man!!!!!