Your computer's central processing unit (CPU), also known as a processor, can be thought of as the brain of the computer. Fast processors typically offer better performance than slower processors, and they are especially useful for running multimedia programs, such as games or audio and video editing programs.
A computer's processor speed describes the maximum number of calculations per second the processor can perform, and is given in megahertz (MHz) or gigahertz (GHz). Generally, the larger the number, the faster and more powerful the processor.
Open System by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking System.
Under System, you can view the processor type and speed, as well as the number of processors installed, if your computer uses multiple processors.