Use Magical Jelly Bean Keyfinder to retrieves your Product Key (cd key) used to install windows from your registry. It has the options to copy the key to clipboard, save it to a text file, or print it for safekeeping.

It works on Windows 95, 98, ME, 2000, XP, Server 2003, Windows Vista, Office XP, Office 2003, and Office 2007.

What’s New in version 2.0 Beta 5:

* Keyfinder released as open source.
* Modified about page to include new GPL license information.