I have a laptop that came with XP home and i bought a Vista upgrade for the laptop. I have just built a computer that needs an operating system and i am wondering if i can revert the laptop back to XP and use Vista on the new computer. I know that Vista is an upgrade and i will have to put XP on the computer before i get Vista on there, but that shouldnt be difficult. What i'm asking is will i be able to transfer the copy of Vista that i am using on this laptop right now to my new machine?