Windows 8 is the next version of Microsoft Windows, a family of operating systems produced by Microsoft for use on personal computers, including home and business desktops, laptops, netbooks, tablet PCs, servers, and media center PCs. It adds support for ARM microprocessors in addition to the traditional x86 microprocessors from Intel and AMD. Its user interface has been changed to make it better suited for touchscreen input in addition to the traditional mouse, keyboard, and pen input.
Minimum hardware requirements
Processor 1 GHz x86 processor 1 GHz x86-64 processor
Memory (RAM) 1 GB 2 GB
Graphics Card DirectX 9 graphics processor with WDDM 1.0
(Not absolutely necessary; only required for Aero hardware acceleration)
HDD free space 16 GB 20 GB of free disk space

FULLY CHECKED IN VIRTUAL PC With 1 Ghz Proccy & 512MB Ram with 128 MB Shared Video Memory.
AND in Core2Duo, 4GB Ram, 8600GT

-- Install--

-Download
-Its a ISO
-You need a burning software such as Alcohol120% or Nero for Burn it into a DVD (~3 GB)
-Boot from DVD
-You can Install as a FRESH O/S, DUAL BOOT or Upgrade from Current OS (ex. Win7)
-Done!
-No Pass Required.