I just got my new computer and got it built yesterday. I installed Vista 32 bit and everything was running fine. The GPU score in vista was a 5.9. I upgraded to 64bit to use all 4GB of ram and even after installing the drivers from the CD/Online the score remains at 1.0. I can play games fine though but it seems that my 3Dmark06 score is low compared to what it should be. I get about 11400, and systems with the same specs as mine(E8400, 4GB ram) and an 8800GT get about 1200, even though the 4850 is much better. Is there something I did wrong which is limiting the preformance?