how to Unregister WinXP ?

Sorry, i don't know is it the correct wrong to said " Unregister "

When i bought New Laptop. Factory default , already install win XP 64 bit.
I just need to key in user name and simple setting without using XP disc.

NOW,
i would like to undo/unregister this back to factory default setting.
so that the next user, there need to do the same thing i did.

 

Microsoft’s own sysprep tool will do this. You will find it on the XP CD in Support\Tools\Deploy.cab It’s easy to use and is just a small app where you have to click a button or two. I can’t remember the exact options you want, so be careful as it does other more extensive things, like removing all the installed hardware drivers.

http://www.microsoft.com/technet/pr...Ref/fae4952d-6489-4628-89c2-30a1c70447ef.mspx
Either do your own research or wait till someone else here can help you with it. I accept no responsibility if you don’t heed my warning and click the wrong button.