How to change Product Key in Windows XP? [SOLVED]

I install Windows XP Professional SP3 32-bit – Black Edition 2013.8 in VMware Workstation and i want to change Product Key with my original Product Key.
EDIT:
I use Windows XP Product Key Modifier. Works great.
Answer #1
try one of these :
https://www.google.com/search?q=change+xp+key&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a