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LMK, you may have ran into the MS Update issue.. Lately, MS Updates have been rolling back Drivers, so after updating the OS, you often need to reinstall the latest Driver.

What do you have to do to have that happen?
I have heard others mention that many times, but actually only here. Which is strange because I read a lot of 3D and gaming sites.
I myself have never had that happen, not in XP, not in Vista, and not in Windows 7.