Here's the lesson that you should have learned from your upgrade experience: Always create a mirror image of your drive before upgrading to a new OS. Note that a "mirror image" is not simply a backup of important data and system files; rather it is a complete and exact image of the boot drive, so that when reinstalled, the system reverts to the identical state that it was in just prior to the upgrade. I use Norton Ghost to create a mirror images, but I am sure there are similar programs available from other sources.
Haste makes waste. A second boot brought it all back. But my aversion to Microsoft is as intense as before. This was an exercise in futility and finally I’ve learned the lesson Microsoft has been trying to teach me over the years. As each device fails it will be replaced by an APPLE product. If it ain’t broke...