Shutdown screensaver can power down, hibernate or restart your computer. It works on all versions of Windows. It can be very useful if it happens often to you to forget turning off your machine. When Windows detects lack of user activity it will start Shutdown Screensaver, which will shutdown or hibernate (or perform any other shutdown action) the computer after certain amount of time. It will display number of seconds left to shutdown, allowing users to terminate the countdown at any time by simply deactivating the screensaver.