Weird 8800gts problems....black images..

[thespeakerbox]

After a while running, say 1 day or two, my images all go black and I have trouble with any windows in XP. Things get distorted and take on the background colors.

When i restart programs like mozilla, the images are all blacked out, silhouette style.

Could this be a card or windows problem. The card is brand new.