GROAN.....what a PITA.
After doing a restore to the last previously known "good" configuration, it seemed to be running OK, but with a ton of almost continuous hard-disk activity, and requiring numerous "updates", and reboots.
It was so sluggish that I was about to rip out what's left of my hair, and start on my beard....
Finally, after letting it run for about 12 hours total, it's settled down, and is operating more-or-less normally.
At least all the installed software on it works without blowing up, and I can use my Flex Radio Systems 5000A again. I haven't tried any of the digital programs, like FLdigi, or the slow-scan/wefax/RTTY programs yet, so I might have to reconfigure the program that runs the virtual serial ports.
And this time, rather than going through and removing all the Windows Updates by hand, I went ahead and took several people's advice and installed the GWX Control Panel, which makes rooting out and killing the Windows 10 "upgrade" notifications and included spyware as easy as a few mouse clicks.
I even sent to guy $10 and thanked him!
The User Guide is located here, and I highly recommend getting this fine utility if you're running Windows 7, 8, or 8.1.
Back to checking if *all* my Amateur Radio software is working......