Windows XP Home CD-Key

So I reformatted my computer.  Started installing Windows XP Home Edition.  And my CD-Key no longer works.  I double-checked every single letter and digit, it's precise.  But it doesn't work.  So I humbly ask the posters here:

Do you have a Windows XP Home Edition CD-Key?  I understand I am asking for a lot.. but I really don't want to buy Windows XP Home Edition.  If you have one, please let me know... we can contact over AIM or email.  And you have my word I will not share the Key with anyone else, it will just be for my personal use.

>>1
There's this fancy new thing called "Google" which might be of some help.