I don't see WHY anyone would WANT to combine OS X and Windows. Windows is an operating system and even though my exposure to it is limited, I don't see ANYTHING that OS X can't do better and with more ease. Besides the cost, I don't see ANY reason for Windows.
Mac OX has something called 'boot-camp' on its newer computers that allows you to run bother operating systems. But I don't know why, except for the cost, windows is so popular. It is ULTIMATELY CUMBERSOME.