Hello Don,
Lets try try the rifle shot, boot into safe mode and run the following.
Open command prompt and type “sfc /scannow” (without quotes) and hit enter.
after, do this “chkdsk C: /f /r /v /b” In command prompt.
If the “SFC / scannow” does find corruption and is unable to fix you will need to use DISM to repair it. You can click here to see how to use DISM.