mac os

[scrapykillz]

hi a friend of mine brought a mac book but it has windows 7 on it does any one know where i can download him the operating system for the mac i have tried two torrent's so far one is a d.m.g file i can not open on my laptop to burn it the other one is some thing about letting me use mac keyboards on my computer or something like that all i need to know is how do i if i can open dmg file's on my laptop i run windows 7 as well so i can burn it to dvd-dl for him to use or is there an iso version out there to download cheers thank you for looking at my post

[crezza]

if you dont mind paying, you can pick up snow leopard for £20 from the apple store!

cant understand why it has windows 7 on it, i thought u had to run bootcamp to put windows on mac