Hello there, i just gotten a MBP recently and found out that it's not recommended for my course, a little bit upset and unhappy, i will need to install windows. but before that, should i back up my MBP first? i'll most probably be installing windows 7s, which bit should i install, 32bit or 64bit? lastly i will also be installing legostorm or something... will it harm my MBP? i'm upset please help !