When I installed XP, I entered a product key that contained a combination of letters (mostly) and numbers. When I pull up the "Systems Property" dialog box, under "Registered to:", a number appears that is all numbers and looks nothing at all like the alpha-numeric product key used when XP was installed. How do I find what product key I used when I installed XP? We have two machines and two product keys but I have lost track which was installed on which machine. I am not sure it matters but it has me curious.