Some sort of Graphical Tearing.

[HodorBonegrinder]

I cant play anymore because my screen fills with these little boxes almost like some sort of tearing. attached screenshots.

[HodorBonegrinder]

[Raist]

quite possible your card's settings are too aggressively overclocked, under-volted, or something is causing it to overheat slightly (or any combination). A very common culprit is insufficient cooling.

Some cards come with a slight overclock out of the box to give them an edge, so even if you haven't tweaked it yourself it may be worth comparing your current settings against the reference specs at the manufacturer's site (AMD or nVidia) and adjust to reference specs if needed to see if it clears up. At the very least, you may want to adjust your fan speed to try to cool it better.

[HodorBonegrinder]

hmm ok. im running nVidia gtx 460s (2) in SLI. not a single other game does this. well that's not true, i think skyrim had an issue before but not anymore. going single card dosent fix it. and no graphics option changes as far as i can tell work.