Right click at Start button > click Command Prompt (Admin) > at the flashing prompt, copy/paste this…….
sfc /scannow
> press Enter.
It will take quite sometime.
When finished, it will give you one of the 3 reports……………(paraphrasing)
1. No integrity violation.
2. Found corrupt files and repair successful.
3. Found corrupt files but unable to repair.
If the report is #1, your solution lies elsewhere.
If the report is #2, check if your problems have been resolved.
If the report is #3, use this method…………….
In the same Command Prompt (Admin) windows, copy and paste this command………..
dism /online /cleanup-image /restorehealth
> press Enter.
Again it will take some time.