Well after months of diagnostics, I have finally found the culprit to my blue screens, aborted games, corrupted graphics, lockups, etc.. My nvidia 6800 ultra card. Guess its a defect. I have tried 3 power supplies with it, (as I know it is really picky with voltage), but still no go. Finally sprung for a ATI X800XT..WOW what a difference. Not only is it faster it performs like a champ, especially with my Nforce3 motherboard.
I am not to say that all nvidias are defective, but it seems for me they seem to be more suspect to errors than ATI cards I owned.