If the following does not resolve the problem, see this article from Microsoft http://support.microsoft.com/kb/921541 (click here).

• Rename or Delete the Normal.dot (Normal.dotm) located at "C:\Users\[user name]\AppData\Roaming\Microsoft\Templates."
• Start Microsoft Word in Safe Mode, and uncheck any 3rd party addins (i.e. Adobe PDF Maker).
1. Press WINDOWS KEY + R.
2. Type WinWord.exe /safe in the Open command line.
3. Go To the addins, and uncheck any 3rd party addins (i.e. Adobe PDF Maker).
• Office 2007 - Office Icon > Word Options > Addins.
• Office 2010 and up - File > Options > Addins.
• Change Manage to "Com Add-ins" and  then "Word Add-ins."
• Uncheck any 3rd Party addins (i.e. Adobe PDF Maker).