First, right click on the desktop and select Properties. Then turn off your screen saver. Sounds strange, to be sure. But the screen saver actually doesn't save energy—it keeps your computer running at full power, rather than slipping to sleep. Next, go to your control panel in the start menu and select power options. Set your computer to go to standby after 15 minutes, your monitor and hard disks to shut off after 5 minutes.