How to Install Windows 8 on Mac and PC

1. Install virtual box (free)
    Download VirtualBox for Windows, Mac or Linux: http://www.virtualbox.org/wiki/Downloads

2. Download Windows8 (90 days trial version)
    http://msdn.microsoft.com/en-US/evalcenter/jj554510.aspx?wt.mc_id=MEC_132_1_4

2. Run virtual box and select OS type --> Windows 8

Also reference to Windows version install
http://windows.appstorm.net/how-to/how-to-try-out-windows-8-in-virtualbox/

Refer to Microsoft Windows 8 System Requirements:

Windows 8 works on the same hardware that powers Windows 7:

• Processor: 1 gigahertz (GHz) or faster
• RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
• Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
• Graphics card: Microsoft DirectX 9 graphics device with WDDM driver