...its def the vid card. 99%. im having similar problems, but with a completely different card. my 5500 will literally paint the screen green whenever wathcing a full screen movie. Its weird, its like a wiping motion, followed by a random striping, until the screen is toatally green. So im gettin a new card.
Intel Conroe e6750
SLI EVGA 8800gts KO's
4GB Patriot DDR2 800mhz
22" Widescreen Sceptre LCD monitor 5ms
OCZ 700W psu
320gb seagate w/ perpindicular tech.
Creative SB X-Fi Fatality
Thermaltake Armor: Extreme Edition