Alright, so I fully plan on installing windows on my MBP, and I'm thinking of getting vista. I have a legit copy of Windows XP, but it was an upgrade version. My original plan was to install a fresh copy of vista. So if I were to go out and buy the "upgrade" copy of Vista, would I be able to simple pop that in the MBP and install it? Or would I have to first install XP, then upgrade to the vista? I feel like installing windows twice over is quite an inconvience. I hope theres a way where I can just input the cd key of XP to validate my ownership of Windows??