If you run into SFC scannow error which cannot be repaired chances are you have some corrupt system components. The fastest way to fix this is by following these steps to repair your system.
Here is an example of the error you are seeing:
dism /online /cleanup-image /scanhealth
dism /online /cleanup-image /checkhealth
dism /online /cleanup-image /restorehealth
DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:X:SourcesInstall.wim:1 /LimitAccess
Once this is complete, you will see you now have a functional windows environment again. One other tip that I would suggest is to re-run windows updates because your windows components were damaged and the updates have not been happening.