I installed a copy unregistered XP, but I have a valid product key XP: how to register in order to install MS Security Essentials?

I get the following message when trying to install MS Security Essentials:

"Windows failed the genuine validation. ..."

Win XP has been installed using a copy XP without registration.

Question:

I have a 'valid product key' (the label at the back of the laptop).

How can I make "authentic"?

Try to use the Windows product key update tool. Carey Frisch

Tags: Windows

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