it sounds like it is an OEM cd-key
My laptops XP edition does not need a key to install because it is bios locked to HP I beleive.
I have the cd-key glued to the bottom anyways.
You should use your original key for the xp home. I beleive that you will be able to use it on your laptop and desktop legally as in the EULA.
someone correct me if i'm wrong
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