Download VirtualBox for Windows, Mac or Linux: http://www.virtualbox.org/wiki/Downloads
Download Windows 8: http://windows.microsoft.com/en-US/windows-8/iso
In this video I give a full tutorial on how to install Windows 8 on your Windows XP, Windows Vista, Windows 7, Mac OS X or Linux computer using VirtualBox. With this method you can install Windows 8 without needing to dual boot or deal with partitions making it the best install method for Windows 8 for free inside a virtual machine.