How can I set a timer to turn my PC off at a set time.....?

I need to set it to turn off at my choice of time..... I want it to shut down at 11pm.... not turn back on till 6am. And not be obvious with visible icons, as I am trying to outsmart a devious teenager. (worth a try surely). Its quite a list of demands but does anyone have any suggestions????? Oh yeah and... show more I need to set it to turn off at my choice of time.....
I want it to shut down at 11pm.... not turn back on till 6am. And not be obvious with visible icons, as I am trying to outsmart a devious teenager. (worth a try surely).
Its quite a list of demands but does anyone have any suggestions?????
Oh yeah and preferably downloadable and free. ;-)
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