Hellooooo !!!

I have a client with an Ibm laptop that he bought few years ago with winxp home edition (The sticker with the serial # is on the back of the laptop).
He asked me to "clean" his computer after several years of use and loads of installations.
Can I download/get cd of xp home with built-in sp3 and use his old xp home code for this new install ? Or his code might work only for ibm specific install/older xp home installations ?

Thank you wise oracles :O)