A Windows CD or DVD

Neither Boot Camp nor any of the Mac virtualization programs includes a copy of Windows; they merely provide an environment in which you can install and run Windows. So you'll need a Windows CD or DVD.

Which Version of Windows?

The first thing to decide is which version of Windows to use. For most people, that boils down to choosing one of the numerous flavors of Windows 7, Windows Vista, or Windows XP. And you must also consider what kind of license that copy of Windows has.

Windows 7

In much the same way that Snow Leopard improved the speed and stability of Mac OS X without adding lots of new features or making major changes to the user interface, Windows 7 closely resembles Windows Vista but is intended to improve performance ...

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