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What program is missing?
What error message do you get that indicates it is missing, and at what time or when running or trying to run what program, please?
Do you mean that you cannot run Windows Update ?
OK. When did Windows Update last work?
And, what error indication or error message and code, do you get when it fails, exactly?
Also: do you run it in your Internet Explorer browser, or as a program 'Windows Update'? if not tried in the I.E. program try it there, please. It can be found in
Tools - Windows Update
Security - Windows Update
in your IE program's menus.
What are the full and exact words of that message, please?
And do you run Windows Update in Internet Explorer?