Hi Nergal,
Thanks for the rapid response. It helped significantly in locating the issue.
The "SkipUserUAC" entry you refer to is not in the Scheduled Tasks section in the Task Scheduler Library where it should be. However about a dozen or more automated tasks were migrated to a System32\Tasks_Migrated Folder with the Win-7 - Win-10 Pro Upgrade, rather than the proper System32\Tasks folder, where they should be and functional. Importing the task from another computer says it is already present. The Tasks_Migrated files aren't visible in the Task Scheduler Library, so they can't be exported, then imported back. Moving them to the Tasks Folder doesn't work, so I suspect they are ID'd by a GUID. Will try to work thru MS (I know good luck with that!) to have it resolved.
An alternative would be Uninstall CCleaner completely, including the registry items, delete the "SkipUserUAC" in the \Tasks_Migrated folder, and reinstall it, which would place that task anew in the correct Task Scheduler Library location. However, I do have a significant number of "Saved Cookies" I rather not delete and start all over with.
Do you know where the "saved cookies" are saved in CCleaner, that I could copy out that file, or reg entry, then place it move it back when the new installation in complete? Hopefully there is just a text file of .dat file containing them.
Thanks,
John