One of the user on MSDN was having issues to completely remove the Office 2007 along with updates, so when the installer doesn’t work then Microsoft has given you the solution to manually uninstall Office along with its subsequent updates and components.
My reply on the MSDN forums was marked as an answer that how you can manually uninstall MS Office, I will share few links which are a complete solution to this and have been documented by Microsoft.
http://support.microsoft.com/kb/928218/en-us
http://support.microsoft.com/kb/971179
Link to the original MSDN thread: http://social.technet.microsoft.com/Forums/en-US/officesetupdeploy/thread/6a95128d-558e-4fc6-9502-3ff69ba00507/#48b468d2-c196-4a71-bfc4-acffab3a2bb7
