How to uninstall the 2007 Office system if you cannot uninstall it by using the "Add or Remove Programs" feature

This article describes how to uninstall the existing 2007 Microsoft Office system if you cannot uninstall it by using the Add or Remove Programs feature in Control Panel.
This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs.

http://support.microsoft.com/kb/928218/en-us