The issue: when shutting down Word 2007 it comes with Microsoft error to restart the application.
The problem occurs due to changed settings in one of office updates.
Update to office 2007 SP2 should solve the problem.

Otherwise do the following (Backup your registry first):

1. Start > Run > type "regedit"
2. Browse to the following key:
3. Right click "Data" folder and rename to "Old-Data".