This solution worked for me:
A Program (Such as a Word Add-In) Modified the User
Interface, Hiding Toolbars or Changing Your Settings
Step 1: Start Word Using Default Settings
Starting Word by using the /a switch on a command line
causes Word to use the default settings for all options
and prevents add-ins and global templates from being
loaded.
The /a switch allows you to start Word without loading the
following components:
The global template (Normal.dot)
Any add-in templates in the Startup folder
Any add-in libraries (.wll files)
User settings stored in the Data key in the Windows
registry
NOTE: When you start Word with the /a switch, changes you
make in Word that affect any of these components are not
written to the hard disk when you quit Word, and the
changes are lost.
For the following example, assume that Word is located in
the following folder:
C:\Program Files\Microsoft Office\Office
NOTE: You may have Word installed to a different folder.
To start Word using the /a switch, follow these steps:
Click Start and then click Run.
Click Browse.
Use the Look in box to locate Winword.exe, and then click
to select it.
Click Open.
NOTE: This step fills in the Open box in the Run dialog
box.
Click in the Open box after Winword.exe.
NOTE: The path to the Winword.exe file in the Run dialog
box is enclosed in quotation marks. Be sure to click to
the right of the closing quotation mark.
Type a space, and then type /a.
The statement in the Open box should look similar to the
following example:
"C:\Program Files\Microsoft Office\Office\Winword.exe" /a
If Word starts correctly, you have resolved the problem.
The problem is that an add-in program or template, the
default Normal template, or the data key in the registry
is affecting how the Word window is displayed when it is
started.
You can find more info using this link:
http://support.microsoft.com/default.aspx?
scid=kb;eng;242368
Good luck!