One of the biggest problems I have found so far with Vista is that, by default, pressing the Power button on your PC puts it to sleep. It's the same if you use the power button in your Start Menu.
It's actually a very good sleep state - your PC will restart almost instantly. However, it's not exactly environmentally friendly to have your PC constantly on standby. So here's how to restore it to a default state of turning the PC completely off:

Go to Control Panel > Power Options and click 'Change Plan Settings' under the power plan you have selected.

Then click 'Change Advanced Power Settings'. A list will pop up. Expand the 'Power buttons and Lid' tree. Select the 'Start Menu Power Button' option and click 'Shut Down' from the drop-down list that appears.

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