You don't need an app like Perfect UnInstaller to uninstall MS Office. Indeed, that may be the source of your problem (there are numerous complaint about the web of it not working properly)! All anyone needs is the 'Programs and Features' applet in the Windows Control Panel. In the unlikely event of an uninstallation error by this method, you can also use the Solution MS has provided here:
http://support.microsoft.com/kb/290301

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Fortunately, I have never had a problem with PU but I also purge my registry of any left over files connected with any uninstalled program. Here is the address to the page I was referring to:
/technet.microsoft.com/en-us/office/ee691939.aspx?LCID=1033&MSG=1&PID=02260-018-0000106-48917