Windows 7 to the current version, Windows 8.1, due to a plethora of different reasons. Microsoft took a different approach when it designed Windows 8 compared to all of the firm's previous operating systems. Instead of designing for a desktop or laptop – predominantly controlled by a mouse – Windows 8 was designed for a touchscreen, creating big 'tappable' tiles in place of small, fiddly buttons.
upgrade to Windows 8.1 from Windows 7, you need to consider various things. The first point to bear in mind pertains to you if you're running a business and are installing Windows 8.1 onto multiple computers, all of which will need legacy apps and services.