Trying to run games in Boot Camp

I have two games that I'm trying to run in Windows 7 with Boot Camp. I keep getting error messages for both of them.

For one:
"General protection fault!

History: UWindowsViewport::OpenWindow <- UGameEngine::Init <- InitEngine"


And for the other:
"Your graphics card does not support features necessary to run the game (shader model 1.1, available on NVIDIA GeForce 3/ATI Radeon 8500 or higher). Please contact your graphics card retailer for further information."


I know my graphics/ram/etc. are all more than enough to run these games, but I figure something hasn't translated correctly from Mac to Windows.

Any help would be wonderful.

Thank you!