https://support.microsoft.com/en-us/help/10164/fix-windows-update-errors

DISM.exe /Online /Cleanup-image /Restorehealth

When you run this command, DISM uses Windows Update to provide the files that are required to fix corruption. However, if your Windows Update client is already broken, use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files. To do this, run the following command instead:

DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:\RepairSource\Windows /LimitAccess