I needed to reinstall Windows the other day. And guess what? I could not find the Product Key! Yikes! Windows has a product key number that must be included when it or Office is installed. It's on the packaging for the CD, usually. If you've lost that, you can hunt around in the Windows Registry, but who has the time?
There's another way to find the key: Use Magical Jelly Bean Keyfinder. This free program will dig the number from the Registry. It works with all versions back to Windows 95. It also works with Office XP and 97. I had my Product Key in seconds. So cool! Find it online
http://www.magicaljellybean.com/keyfinder.html