Bottom line is I finally got some free time, did the upgrade install and it does not seem to have affected anything adversely, and lo and behold sfc reports no integrity violations. There was a somewhat odd message on the last reboot of the upgrade: "Setup has determined that .NET Framework 4.5 is corrupt and must be repaired. I already asked Go The Power about the apparent contradiction but got no reply so no big deal, all's well that ends well. Thanks to all for the help. I am keeping a backup image for a while until I try everything just in case.
Update: A few things went whacko:
1 - Windows Update tried to install 180+ updates, around 95 of them failed, then after a restart it wanted to install 80+ more, which succeeded, then a few more, then some more. Now the update history shows a ton of updates as failed, most of which installed on the next run(s), The ones still showing as failed that did not install are:
(KB2510531) - Failed - Security Update for Windows 7 - Manual Install shows as Not Applicable
(KB2598845) - Failed - Internet Explorer 8 Compatibility View List for Windows XP - Manual Install shows as Not Applicable
(KB2685939) - Failed - Security Update for Windows 7 - Manual Install shows as Not Applicable
(KB2703157) - Failed - Update for Windows 7 - Manual Install shows as Not Applicable
(KB2718704) - Failed - Update for Windows 7 - Manual Install shows as Not Applicable
(KB2729452) - Failed - Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 - Manual attempt - would not even download from MS
(KB2789645) - Failed - Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 - Manual attempt - would not even download from MS
(KB2836943) - Failed - Update for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 - Manual attempt - would not even download from MS
(KB2840149) - Failed - Security Update for Windows 7 - Manual Install shows as Not Applicable
(KB3005607) - Failed - Security Update for Windows 7 - Manual Install shows as Not Applicable
(KB3006226) - Failed - Security Update for Windows 7 - Manual Install shows as Not Applicable
(KB3045999) - Failed - Security Update for Windows 7 - Already Installed but I cannot find a record of a successful install
I now have 185 Installed Updates.
2 - AVG Internet Security - the firewall would not run ("error communicating with a driver) - fixed by uninstall and reinstall.
3 - Internet Explorer 11 would not install - fixed by manually getting all prerequisites and removing Internet Explorer 9.
Edited by Zomalaja, 13 July 2015 - 12:37 PM.