Hmm. You don't have monitor sync or something list that forced off in your graphics card options do you (in windows itself not in the game).
Other than that I don't have any other ideas at the moment. It might be something broken in Windows 7 (if it is I hope they fix it before they release).
Anyone else have any ideas?
Depths of Peril, Kivi's Underworld, Din's Curse, Drox Operative, Zombasite, Din's Legacy, & Drox Operative 2