That's a truly odd install method. When I use Nvidia's installer, it just works. Try the easy way?
I'm running Windows XP Home SP1. I have an NVidia GEforce4 MX420 video card. It was preinstalled by Dell. But now, under display adapters in the Device manager all I get is "Video Controller (VGA Compatible)". I have tried to reinstall the drivers using the Nvidia drivers found at their website but still no go. I get a "Access is Denied" message with the Hardware update wizard when I try to reinstall the drivers. Does anyone know what I can do?