Reset menu and toolbar in MS Word for Mac 2011

http://support.microsoft.com/kb/2026220

Step 2:  Word 2008 and 2011: Move the Normal.dotm template file to the Trash

1.     Quit all Microsoft Office applications.

2.     On the Go menu, click Home.  

3.     Open Library.
        Note The Library folder is hidden in MAC OS X Lion. To display this folder, hold down the OPTION key while you click the Go  menu.

4.     Select the Application Support folder.

5.     Select the Microsoft folder.

6.     Open the Office folder.

7.     Open the User Templates folder.

8.     Move Normal.dotm to the Trash.

9.  Start Word, a new Normal.dotm template will be created when you choose Quit Word in the Word menu.

Note that when you had Word 2004 on your Mac previously and you now have Word 2008 or Word 2011, also check if the Word 2004 Normal file is present on the system, if so, trash this Normal template file as well.