Two Operating systems?

I think that kind of system is referred to as a hackintosh, you'll have to google that for some idea of whats involved though, you can't just install a mac Os on a windows Pc, I know that much :-)
Moto

Yes, there are several ways to go about doing this. (at least I think)

Give this a shot.
http://www.windows7hacker.com/index.php/2010/04/how-to-...

It is "sometimes" possible to install OSX on non-Apple hardware but it's hackish (hence the Hackintosh reference). Unfortunately it's also a violation of the OSX terms of service and against my own personal beliefs against using shitty software so we can't really do more than tell you of its existence.

I personally couldn't care less about Apple's ToS. Not that I'm a "free everything" kind of guy, but I personally object to a company having such strenuous terms of use on products we bought from them. Theres absolutely no legitimate reason that modifying the computer in such a way would impact their business. So screw em.

Disclaimer: Nekulturny is a private individual expressing his own personal opinion. Nekulturny's opinion is in no way shared by Tom's Hardware or any of its affiliates.

Oh I couldn't agree more. However, terms of service violations are a good way to get a product key disabled (although I'm not sure if this has ever happened with Hackintoshes, I know that Apple won a suit against someone selling them)