[MaddogK]

Concur- temperature problem, check your fans and clean em out. Shut down any un-necessary external apps.
Ensure DX9C is installed, and you may want to pull down the video settings in the game to 'med' or below. A cheap video card is better than onboard video.
2 gigs of ram should run SHIV without issue (I used to run it on 1 gig). I would think a RAM problem will give you a BSOD but it doesn't always. You could also have a failing power supply.
Do you still have sound when you lose video ?