Little help needed. My family's PC has a GF4MX, and my brother recently got Half-Life 2, so I upgraded the video drivers to 66.93 for max performance. Now we're getting a strange problem. When my brother starts any game, it goes into software acceleration mode. If he tried to change it to hardware aceeleration, he gets an error that hardware mode isn't supported. When I went to the Advanced Properties in the Display panel, there was no nVidia tab! But I checked Device Manager, and the drivers are still installed. I've tried uninstalling and reinstalling the drivers, and using Driver Cleaner to clear previous drivers out of the system, but we still can't get 3D acceleration to work, or an nVidia tab to appear. Anybody with insight on why it's happening and how to fix it?