Hello,
Let us start Word in application safe and then open the file by going to File and Open and check how it works.
To do that, press the ‘Windows + R’ key on the keyboard.
In the Run open box type in ‘Winword /safe’ and hit ok.
Note: There is a space between Winword and /.
If application safe works, try the steps in the following article and check:
http://support.microsoft.com/kb/921541
Follow the steps and let us know if that helps. If the issue persists, reply and we will be happy to help you.
Thank you