I have no clue. But to be safe go out and buy a USB/CD. When putting on it you will be prompted to format your existing drive. Don't do it, but just create a new partition. It's simple. Which version is it? I personally use windows on my mac to hide things from my parents. When doing it I used boot camp, not an option for windows. But when it was created it is not genuine software. So you will be annoyed by pop ups saying "You may be a victim of software counterfeiting". Just buy a key what ever your version is here, and you'll be good.