How To Find Out How Long Your Windows System Has Been Running Since Last Reboot
Sometimes you want to find how long a desktop or server has been running. A example is if you are having troubles with a system rebooting at random. To find out how long a windows machine has been powered on you can run a simple command.Steps below will work for Windows xp, Windows Vista, and Windows 7.
Click on Start > Run
(Tip: Windows keyboard shortcut - Windows Key + r)