For a permanent solution you can just set it on fire.
place finger on on.off button and hod until it shuts downNOTE This isn't a recommended way to shut down regularly.Outline your problem in more detail.
could you explain what you want a little better. Do you want to know how to shut down your computer normally through windows. Do you want to remotely shut it down. Do you want a program to shut it down at a certain time. Anyway if you explain better I am happy to help you.
+1 ! And @hackrz, what do you mean by 'computer'? Today, even a washing machine has a computer inside. Point at anything with more than 3 LEDs and you will most probably a microchip - more powerful than anything they called computer some years ago - inside. So ... okay, we might guess, you mean a desktop or laptop PC. But still - what operating system do you use? Windows (XP/Vista/7 - Home/Pro) Linux (but what distribution) some Apple stuff?
Unplugging it is quick...
What computer? Apple, Linux, Windows, And what version?