"This problem is specific to the user's preferences (usually a corruption in one of those files). Removing and reinstalling the Office "software" will NOT fix this problem. However, Office 2008/2011 stores preferences in TWO locations in your home directory. Deleting the preferences from BOTH these locations will fix this problem.

NOTE: Backup your computer before doing these steps!

Delete files in:

Macintosh HD > Users > ~your home directory > Library > Application Support > Microsoft > Office > Preferences > Office 2008 or 2011

Macintosh HD > Users > ~your home directory > Library > Preferences > Microsoft > Office 2008 or 2011

Then Apple menu > Logout and login the current user or just Restart the whole computer.

NOTE: To get to a user's Library in OS X 10.7 or 10.8 go to the Go menu while holding down the 'alt' (option) key and select "Library".

NOTE: Deleting office preferences may mean you need to reset your personal settings/preferences in all Office applications. Entourage/Outlook email, accounts and rules should be safe as they are stored elsewhere."