All commands should be run from an elevated command prompt.

1. Run dism /online /cleanup-image /scanhealth
2. Run dism /online /cleanup-image /checkhealth
3. Run dism /online /cleanup-image /restorehealth
4. Mount the Windows Server 2016 ISO as a drive (E: in this case)
5. Run dism /online /cleanup-image /restorehealth
/source:WIM:E:\sources\install.wim:1 /limitaccess
6. Run sfc /scannow
7. Run Windows Update

https://bornsql.ca/blog/repair-windows-server-2016-installation/