Due to the presence of the malicious programs and to the need of computer security the first Antivirus Software program was develop in 1987. During that time malicious programs were obtained or passed on through the use of a floppy disk. Since then computer engineers started developing more advanced utilities to counter the computer threats. Today, an Antivirus software program is among the tools that users should equip their computers with. There are several ways in which a computer gets easily infected with harmful programs and more and more protection tools are developed to provide solution to all of these dangerous online threats.