To restart a computer is the process of closing down a computer system and loading it up again straight after closing it down. To restart a computer has become a standard function due to the popularity of the Windows operating system which has a restart function on it's shutdown menu. Restarting a computer in Windows is a quicker and more power saving option than actually turning off and turning back on the computer. Restarting a computer is usually used for when Windows develops an error or needs to update it's program information.