I had the same problem. Had Office XP and new installed Office 2007 Enterprise. Resolved the problem in this way.

1. I uninstall Office XP (don't know if this is necessary, but I went and did it)
2. Opened microsoft word (waiting for the configuring message to end)
3. Click on office button (upper left corner), pressed word options button
4. Click resources button, then run microsoft office diagnostics

Once the diagnostics ran, it corrected the problem.

Hope this works for you;