I think this is your problem. There was something similar: Recovering from failed update [Resolved] .
Of course, we don’t know how things got lost. As for the missing DLLs, you may have to re-install Windows (or revert to an earlier level).
Another possibility is SFC.exe. See https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system .