No rush. I will be a bit busy for a while now.
The sfc /scannow tool needs to be run several times if it can't fix everything, with reboots in-between each run, and Fast Startup turned OFF. Once that's done, if there are still problems, the [SR] log generated will give some clues.
At an admin command prompt:
It's important to have a look at this report, as there have been times when persistent problems were MS-induced, and not fixable.
findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"
DISM would be the next step if System File Checker can not fix everything.
Failing those, a repair install using an in-place upgrade usually does the trick.