go to power options(right click the screen -> screen saver -> power), then go to the power schemes tab and select after what time you want your hard disk/s to shut down until you use your computer again.
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I would recommend you put your PC on standby that way it shuts off your computer but of course once you move the mouse it wakes up again. Or you can choose to hibernate so it saves everything your doing to your hard drive and once you turn your PC on it will restore everything you were doing from the hard drive. But putting your PC on stand by you shouldn't lose any work.
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