you have to use bootcamp to get windows on your mac you will need a windows install disk and youll have to partition a portion of your hard drive i would suggest around 20 gigs.
if youve got a macbook it may be real laggy, but if youve got the macbook pro it has is actually meant to be able to run both windows and mac and has dual processors and shit to do it.
The problem is, with the new Mac's they have a protective system that doesn't allow you to pirate anything. So you can't pirate and emulate Windows or any other things, Jibbin has to actually make the game fit for Mac's.
you try parallels? Easier than bootcamp, but definitely slower running 2 OSs at once. http://www.parallels.com I think you can try it free for 30 days, and probably find a key somewhere to unlock it.