The following free products are able to show you the
Software License key for Office:
Belarc Advisor
http://www.belarc.com/free_download.html
Magical Jellybean
http://www.magicaljellybean.com/keyfinder.shtml
Also this one, but maybe not Office?
AIDA32
http://www.aumha.org/freeware.htm
Bob
I've lost it. Is in the registry somewhere?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic