Many people own a computer and never play games on it.
Some people buy a computer with only that purpose in mind.
First of all, decide what types of games suit your needs. Any one or a combination of these may appeal to you. One of the most popular game genres on the PC is the war simulation. Campaigns for titles such as Command and Conquer and Warcraft have become best sellers and are even online now. In these types of games, you command armies that attempt world domination, or to just kick a friend's butt.