You'll probably have already run the
sfc /scannow command in an elevated command prompt. Chances are, it found corrupt files and was unable to correct them.
You, therefore, moved onto executing
dism /online /cleanup-image /restorehealth which then presented you with the following error message.
From an elevated command prompt, enter dism /online /cleanup-image /startcomponentcleanup
Once this completes, run
sfc /scannow and finally, re-run the original
dism /online /cleanup-image /restorehealth command and you should be good.
Alternatively, download the Windows 10 ISO tool to upgrade your computer to the latest version. This should also correct the corrupt files.
We personally run this after running all the above commands.