Thanks, Greg. I was not aware that System Restore Points were deprecated with an installation of a new OS on top of the previous (that is, not a clean installation). I was able to install 22621.521 on the Nitro 5 without problems and it appears to be running well. However, the Dell Optiplex 3891 media creator update did not fare so well. It did not finish the installation and gave me the message ...
"Your PC can't be upgraded to this version of Windows. Windows Update will automatically offer you this version of Windows once the issue has been resolved" ...
There was also a "Learn More" link showing 3 possible issues, one with the Sound Driver (I do not have the driver mentioned in the article) and two separate Group Policy issues that are mentioned above in this thread.
I'd sure like to know who is working on these issues, Dell, Microsoft, or Intel (or all three) and if I, as an individual, can contact them and find out exactly what the problem is.
Well, I guess it's time to get away from the big monitor (50" Samsung TV) sitting 2 feet in from of my 81 year old eyes and join the wife to watch English murder mysteries on one of the streaming channels. Just a note to say that the Brits create much better Television than any of the US Networks or streamers.