|It seems like you need to re-register your Word. You can use startup command line switches to start Word.|
Tutorial from Microsoft:
In brief, find the location of your Microsoft Office, for example, if your office is located in C:\Program Files\Microsoft Office\Office12
Go to Start->Run, and paste following line in the commandline box.
"C:\Program Files\Microsoft Office\Office12\winWORD.EXE" /r
/r means re-register of Word in the Windows registry.
wait until the configuration is finished, and re-open Word, problem should be solved.
Hope it works.