I went thru the procedures, deinstalling old drivers, running Driver Cleaner, restarted, and, instead of running the display in basic vga fallback mode, the screen was totally blank. Luckily I had my old onboard vga to fall back on, moved the monitor plug to the old port (which was indeed running in basic 16 color 640 x 480), installed the new driver to the new card, set up a dual monitor desktop and went from there. It could be that having the old onboard video still around (I deinstall and disable it each time, but it still reappears each boot) caused the rebooted computer to recognize the onboard stuff as the only video and run totally thru it, but there is some risk that the same thing might occur to someone who has no fallback to the card for which they are installing the new driver. In that case, having an up to date emergency boot disk might be a good idea, also having a sound knowledge of how to reboot into safe mode if a blank display shows up.
