Reset Menus or Toolbars That Someone Else Has Customized
The Problem:
A new temp borrowed my desk last week while I was out of town, and she messed up my menus and toolbars in the name of progress.
The Solution:
You can reset the menus and toolbars to their default settings in moments. Choose Tools 
Customize and click the Toolbars tab. Click the toolbar or menu you want to reset (to reset all menus on the menu bar, select the Menu Bar item) and click the Reset button. In the Reset Toolbar dialog box, make sure that Word has selected the right template or document, and then click the OK button.
After you close the Customize dialog box, Shift-click the File menu and choose Save All. If Word prompts you to save changes to the Normal template, click the Yes button.