You will need to install it into the Windows operating system.

You can install Windows (you will need a copy of Windows) on a Mac by using virtual machine programs such as:

Parallels http://www.parallels.com/products/desktop/

or

Fusion http://www.vmware.com/products/fusion/overview.html

or

Virtual Box https://www.virtualbox.org/

or in a dual boot configuration using :

Bootcamp that is included with the MAC 

http://www.digitaltrends.com/computing/how-to-install-windows-7-on-an-imac/