uninstall the application, then do the following...
Open regedit, goto Hkey_Current_User\software\microsoft\office. Delete everything there.
Hkey_Local_Machine\software\microsoft\office. Delete everything there.
Then goto the following location: %userprofile%\application data\microsoft\office. Delete it all.
Then reboot. Reinstall office. That should fix it for you.
Good luck.