1. Three days ago.
2. When I downloaded it, it said already installed.
3.ibid.
4.Installed or not applicable.
5.Yes.
6. Just Iobit, and I turned off The Registry Cleaner as per your directions.
The day-before-yesterday I ran Chkdsk /f and Chkdsk /r one after another and in Safe Mode. Afterwards Dism /Online /Cleanup-Image /StartCompoentCleanup, followed by the same and /ResetBase worked with complete record speed! I thought I was out of the clear, but the computer chrashed yesterday morning. I did a reset this time. The computer now works fine, save that sfc /Scannoe run from CommandPrompt X: and Dism /Online /Cleanup-Image /RestoreHealth still always find corrupt files, although still always repair them.