A family of Microsoft word processing software products for creating web, email, and print documents.
Okay, this is very mysterious. I would suggest that you start Word in Office Safe Mode: quit Word and restart it pressing Ctrl while Word loads. If you are able to use the GoTo shortcut keys normally in this mode, then have a look at http://word.mvps.org/FAQs/AppErrors/ProblemsStartingWord.htm for some troubleshooting suggestions. A badly written add-in is the most likely culprit.