Once you have secured your files.
Do a full shutdown. Windows does not do this if you choose "Shutdown". I recommend disabling "Quick Start" (this may involve a Restart) and then doing a shutdown and turn it back on.
Otherwise, do a "Restart" then "Shutdown" and turn on.
With Quick Start (or is it Fast Start?) enabled, Restart re-initialises the software - Shutdown and turn on re-initialises the hardware. Or do it the other way round ??? Or both. By the way - I hate Quick Start.
Administrator command window
chkdsk /f
Read reports and make sure it's happy.
If you can do a useful System Restore consider that.
OR (you can do this anyway, at any time if you want to check the integrity of the OS files))
sfc /scannow
If UNFIXED errors.
{
DISM /Online /Cleanup-Image /RestoreHealth
(I think it's all case insensitive)
Sometimes it tells you to run it again - do so.
If it says it can't fix it I can't help you further.
Finally re-run sfc /scannow
}
These take a while to run and % progress reports are unreliable.