I had installed BlackBerry Desktop Software to use my BlackBerry Perl on my Vista HP Tablet PC. After the install Microsoft Word 2007 would not close correctly. It kept trying to recover the opened document and then corrupt the document save.
After researching Microsoft's site this fixed the problem.
Note that this is a registry fix so BACKUP before you attempt to make this change!
Go to HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Data
Right click on the "Data" folder and delete it.