Yeah, when Windows tries to auto-detect and install drivers, try to cancel it, then boot up (even if you have crappy graphics) and run nVidia's driver program from inside Windows. If it doesn't come with a .exe, you can go to the control panel and Add Hardware or something. Doing it manually generally works better than letting Windows do whatever it wants, because Windows is dumb. I don't know why it'd even touch your config.sys.