Windows 8 is a highly controversial operating system and a big gamble for Microsoft that can largely be attributed to the new Start screen interface that the company introduces in it. The Start screen is not just a program launcher like the Windows Start menu was, as it is also the location where apps are run in. Apps, of which some come pre-installed with Windows 8 and others can be installed from the Windows Store, run in full screen on the interface. However, you can add your own shortcuts to the Start screen page, to open documents or desktop programs quickly from here.
If you like Windows 8's start screen but want to keep on using a previous version of the Windows operating system instead, you may be interested in a new beta program that IOBit just released. WinMetro basically adds a Start screen-like interface to versions of Windows that do not ship with it. The program is compatible with 32-bit and 64-bit versions of Windows XP, Vista and Windows 7.