Possibly it may be the problem below. However, if this doesn't work, please
let us know the version of Word and Windows and are they patched fully up to
date? Also, are you able to open Word but not the documents? Details were
sadly lacking in your post.
That's a symptom of a Word Data Key corruption - usually because Word has
been running when updates are installed.
Run Regedit and expand by double-clicking to the key below. With DATA
selected, press DELETE. Word will automatically recreate a new key when it
is restarted.
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Data
Symptoms of Data Key corruption include:
• The mouse does not work when you use Word.
• You cannot open a Word document from the Search window in Windows
Vista.
• You cannot open a Word document from Windows Desktop Search.
• Word crashes when you try to start or exit Word.
• Word crashes when you open the Open dialog box.
• Word crashes when you save a document.
• Word crashes when you close a document.
If you feel uncomfortable editing the registry yourself, Microsoft have a
fix that will do this for you.
http://support.microsoft.com/kb/940791 and press FixIt
