If not, download the file from the link below and then run it to install SP1. (Yep, it's a large file so you'll need broadband or a friend that has broadband.) After installing the service pack, then visit the Office Updates site and install all other Office 2007 updates as well.

http://www.microsoft.com/downloads/details.aspx?FamilyId=9EC51594-992C-4165-A997-25DA01F388F5&displaylang=en

I've heard of this issue on Office 2007 before.. Be sure to save documents frequently. In addition, if you're using "Paperport", try removing any Paperport COM add-ins from Word. There may be other add-ins which could cause the issue as well..

Hope this helps.

Grif