This morning, I powered on my computer, and…nothing. Vista refused to start. There was just a plain blue screen (not the BSOD aka Blue Screen of Death) with no icons, no wallpaper, no taskbar…NOTHING. I figured it was a video driver problem, so I uninstalled the present nVidia drivers, downloaded fresh ones from the Net (I could do all this because I booted up using Safe Mode with Networking).
Installed the new drivers in Safe Mode, rebooted, and…same problem. Made me wonder, so I uninstalled the nVidia drivers, rebooted and asked Vista to look for new video drivers. Did this in Device Manager. It did so, and after one more reboot, voila! Vista started up with all the familiar icons, wallpapers, etc.
Man, this OS can be picky about video drivers. So a good thing to try would be to let Vista connect to the web and download the drivers it deems “suitable” for your system. This was what I did with my oldish Creative SB card, and I’ve had no problems with that.