But after i had trouble with the 256, i uninstalled the drivers, and then installed the 196. I uninstalled from control panel, and after un-installation the nvidea driver and other components like physx were still there in the add/remove, even though it went through the process. Also, i have dx 9 if that matters at all.
XP I assume? Have you tried going through the system32 folder and deleting the Nvidia files that are in there and then installing the latest ones?