Windows 8 is Microsoft's latest operating system which is completely redesigned. It moves away from the traditional interface to a completely new interface known as Metro User Interface. The familiar start menu is now gone. Icons and windows are replaced with live tiles and magazine styled interface. Unlike any previous versions, Windows 8 and its variation RT works across multiple architectures and has been optimized for touch screen. So it will work on Intel based PCs or an ARM based tablet.

You can perform a clean installation of Windows 8.1 or Windows 8 using installation media, such as a DVD or USB flash drive. You don't need a previous version of Windows installed on your PC to perform a clean installation of Windows 8.1, but you do for Windows 8. If your PC doesn't have a version of Windows already installed, you'll need install a previous version of Windows or buy Windows 8.1 or a System Builder version of Windows 8 at a local retailer if it's available in your country or region.