How to activate window XP without Product Key

I have been busy with my work recently and not updated my blog.
While i do my work, i accidentally explore on how to activate window XP without product key.

I try the same method as website below, then try validate my window in microsoft website.
As result, it work perfectly,even microsoft fail to see any problem.

http://www.gupshupblog.com/2009/02/how-to-activate-windows-xp-without-product-key/

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