>>>Tore
>>>
>>>Please can you tell me where I'm going wrong? I have a PC and there's some code stored on it. I get an error message.
>>
>>Press the button marked "Power" and the message will disappear.
>>
>
>Cant find a button marked "Power" anywhere... All I have is a button with a big O and a small letter I on top of it, do you think I should call the manufacturer to reclaim the missing "Power" button?

To be sure, unplug directly computer from power (without Shutdown first), then go and turn off the Power of whole Building :o)