I'm sure I know the answer, but is this a legit, bought-from-the-store edition of Windows 7?
Or did you download it through Technet/MSDN and burn it to a disk?
My FS/FT Thread
HEATWARE Xfire Steam ID
Certs: MCTS, MCITP, HP APS
Server: AMD Opteron 170 @2.95GHz | 4GB DDR 3-3-2-7 | 1x Samsung SPT 500GB, 2x WD Black 2TB, 2x 1.5TB Western Digital MyBook