I wanted to boot into Windows XP Pro SP2, Windows Vista, and of course Mac OS X! However, after I install Windows XP Pro, then Windows Vista, Windows Vista take over and it wouldn't even boot. When holding down Option Key while starting up, only 2 Drive Pop Up as suppose to 3. I guess you have to fiddle around with the bootsec in Windows? It is complicated? While I wanted Windows Vista, I wanted Windows XP too because I don't want to keep formatting my Hard Drive because Vista keep messing me over.