hey carl, sorry for not posting , but i was basically tired of this pc and went to my laptop.
I was also waiting for a new hard drive so that I could start clean w/ fresh window's install.
The problem persists when playing Starcraft II, the game/screen froze hard, and i had to shut power off.
I also ran before the memtest for 10 passes overnight and no errors were found.
I'm thinking now that it could be the video card or the power supply. How can i know?
thanks for your time