Use your mouse button to right click on the 'My Computer' icon on your desktop. This opens a menu. Scroll down and click on 'Properties' at the bottom of the menu. A new screen opens. The Operating System will be reported towards the top of this new screen. The RAM and Processor speed is reported towards the bottom of this new screen.

You can also discover your computer's processor speed by turning off your machine and then starting it up again. While the machine "boots up" you will see multiple lines of DOS code flashing briefly over a black background. Often, you will see "processor speed" appear for a few seconds, with a value in MHz.