Alright I just got my MBP today and I was thinking of installing Windows Vista through Bootcamp, but then I remembered that I had already used my copy of Vista Ultimate OEM on my computer. So my question is, how many computers can be running on the same activation key at once? From what I remember, it's only ONE, correct? So I'd need to buy a new copy of XP/Vista/7 to use Bootcamp, right? Sorry if I already answered my own question, but I just want to make sure 
