Ran across a problem today where a legit Office 2003 got flagged as being not legitimate, displaying a nag screen each time an Office application got started. The Office Genuine Advantage update (short: OGA) is an update installed with Microsoft Update, similar to the Windows Genuine Advantage update (short: OWA). While Microsoft flags the update as not uninstallable, there are ways to get rid of the update anyway.

Uninstalling the update is your best bet, and can be done from a (elevated) command prompt.

Be sure all Office applications are closed.

Open a Command prompt (cmd.exe).

Type in: msiexec /X {B2544A03-10D0-4E5E-BA69-0362FFC20D18}
This will invoke Windows Installer w  ...