Sorry to knock what your saying nihil But i doubt it would matter how much video sharing there is, it doubt it would have this problem.
I wasn't thinking of the specific problem, but of his gaming and video experience in general. That chipset will share 256Mb if you let it, but I suspect that the default might be 128Mb. It can make quite a difference if you are running Vista

A half-decent video card isn't that expensive, and that is certainly the way I would go. I can't say I know of anyone who is even moderately into gaming who doesn't have a separate video card.

What KK needs to do first is go into his BIOS and change the "restart on error" option to "off", then we can see the exact message on his BSOD.