Lost XP key

I am using Xp Pro and I lost my key. I need it to validate my system for XP updates. The machine is running fine. How can I find it on my machine?

 

Belarc advisor, everest, and aida also show the key.

 

Thanks Steve, I don't know what sparrow is talking about though.

 

OLDSALTY--

They are all machine and software diagnostic tools which tell you a lot more about your PC than Magical Jelly Bean. And Aida is now Everest.
http://www.belarc.com/free_download.html
http://www.lavalys.com/ (the home edition is free)

 

Old Salty - use this link to see three programs that will tell you what you want to know. There is a link provided for each.

http://bobbalogh.com/whatsinyourcomputer.html