Combined with your other post (about spontaneous restarting) I'm inclined to think of some hardware issue.
For the BSOD's when starting games I would start with running DXDIAG (the DirectX diagnostics). With me, it somehow works from Start>Run, and also from MSINFO32, but you might have to do a search for it on the hard disk to run it. It's possible that results in the same BSOD's.
Kees
When i start trying to play some games, I get a blue screen. Some games include Natural Selection for Half-LIfe, CivII Gold, D2 LoD and some other ones. Help me please, I want to play those games!.

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