Cannot update Microsoft Office 2011
Quit all Office applications, and move com.microsoft.autoupdate and com.microsoft.office.plist from ~/Library/Preferences ... and any MicrosoftRegistrationDB .plists &amp; the MicrosoftRegistrationDB.plist.lockfile from ~/Library/Preferences/ByHost to the desktop.

You may have to input your password for some of this. Start up an Office app again and see if this helps. The applications rebuild their preferences files. You may have to enter your registration code again.