You would have thought that you would need to purchase a PC with an OEM copy of XP really...or at least a hard drive or something....they have become really easy on OEM software recently.
I mean I bought a case and a camera dock with an OEM copy of XP....yes thats right....I am going to install XP onto the dock and then put it in my new case....voila.
Jamie
p.s: could you rephrase your original question, i'm not sure I understand....there is no difference between a desktop and laptop OS.