I agree, it could be driver related.. If you can get into safe mode, try and replace the graphics driver.

__________________
AMD X2 BLACK EDITION 3.2GHz SAMURAI COOLER::GA-M51 MB-HEATPIPE CHIPSET COOLER::3GB XMS2 PC6400 RAM:: POWERCOLOR 4870 512MB::160GB BARRACUDA RAID 0::SOUNDBLASTER AUDIGY::SAMSUNG WRITEMASTER DVD-RW/PIONEER DVD::HIPER MODULAR 530W PSU::THERMALTAKE ARMOUR Jr CASE::RAZER COPPERHEAD MOUSE::VISTA HOME PREMIUM SP1