first of all, what drivers are you using for your card? go to nvidia.com and get the latest ones.
also, with that card, use Pete's OGL2 and check out this thread: http://www.ngemu.com/forums/showthread.php?t=45533
also, with that card, use Pete's OGL2 and check out this thread: http://www.ngemu.com/forums/showthread.php?t=45533