|format hard disk|
So whats you problem?
If you don't know how to do it press F1 while at the desktop. When Help appears type in format hard disk, then start reading.
That box that sits on your desk with a display unit, keyboard and mouse and various other things plugged into it is a computer. A CPU is a chip on the motherboard, the big one with a fan and heat-sink on it. All the formatting that can be done to the CPU is done by the manufacturer.