this is how
(1) In the Finder, select /Applications/Microsoft Office 2008/Office/OfficePID.plist
, and then on the File menu, click Move to Trash.
(2) Select /Users/yourusername/Library/Preferences/Microsoft/Office 2008/Microsoft Office 2008 settings.plist
, and then on the File menu, click Move to Trash.
(3) On the Apple menu, click Restart.
(4) After your computer restarts, open any Office 2008 application.
(5) The Office Setup Assistant opens.
(6) Accept the software license agreement, and then enter your valid product key.
Jesus Bless you!