A:Everest home edition is a free software (but will not work on any computers that are part of a domain), that will show you the liscence number of most software installed on your PC (including Windows and Office).
Here is a link:
http://download.softpedia.ro/software/SYSTEM/INFO/everesthome220.zip
btw - this software (only the free version) was discontinued, so you better hurry and download it while you can. It alos does many other great things (like benchmark tests)
