Can't add computer to manage

Can't add computer to manage

I get this message when trying to download msi files and patch so I can open my Excel program. I am missing the proplus.msi file. The message says- No computer is being managed by desktop central.

When I try to add my computer it asks for a domain name. I have no idea what to put in there. I tried my name and my aol signon but that didn't work.
Lynn


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