[franca]

Prevent a catastrophe
http://www.magicaljellybean.com/keyfinder.shtml
Okay, losing your Windows product key might not be a catastrophe. Most people probably don’t worry about it. But it could cost you money if you need to reinstall Windows.

A lost key means you’ll probably need to buy a new license for Windows. Since you’ve paid for it once, that hardly seems fair.

Well, you can download Magical Jellybean Keyfinder from today’s cool site. It locates your Windows product key for you. This key will allow you to reinstall Windows. It also finds your product key for Microsoft Office – in some cases.

I suggest you find your key now before you need it. Print it out and keep it in a safe place. If your computer crashes and you have to reinstall Windows, you’ll need it and you’ll have it handy!

Note: Magical Jellybean Keyfinder only works with Windows 98, ME and XP.

[JohnWill]

Either of these utilities provide that key and much more. They're just generally useful to have around.

Everest Home Edition

Belarc Advisor

[karnak]

If you own a legitimate disk for a windows os and lost your key you can call microsoft and after they get some info off the disk that you provide to them to show you really have a legal copy, they will give you a free key. And the call is free also. I know this because the very same thing happened to me just very recently. They were very friendly and courteous. Really.........