This may be a stupid question... but my brother has the Windows XP Home edition and it is a service pack 2. On the disc, it says "Upgrade" on it. I looked on the internet and the upgrade discs are only $99 where as the other is $200. He swears that he paid $200 for it. My question is this, can I use the upgrade disc to install bootcamp? Is this possibly the other disc, not the upgrade(because the "Upgrade on the disc is the only indication). And if I cannot use it... what is the cheapest windows software that I can buy to install bootcamp?