Hmm ... I would just do a system restore at this point but that's just me! Have you checked the error log in the Administrative Tools section of the control panel? When you install NVidia drivers, do you uninstall the old ones first or just upgrade the existing ones? I doubt this has anything to do with anything, but does DirectX show up with any problems? Nevermind, it's definitely the NVidia detonators, eh?
I have the same video card as you and when I had an AMD Athlon XP it would constantly restart itself (10+ times / day regardless of what I was doing) unless I disabled hardware acceleration. Now the card is in my P4 and I haven't had any problems since.
I'll get back to you if I come across anything. Sorry I can't be more help right now.
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The Queen of DaniWeb
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