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When we think about computer viruses and their creation, the way they work, where they arrived with a problem they created, we believe that it is a new phenomenon that threatens the world of PCs for most of the current. But the actual truth is that computer viruses have existed for more than most people know.

The first computer virus known as 'Brain virus' was created in 1986 by two Pakistani brothers, Amjad and Basit Farooq Alvi. The virus, which spread via floppy disks, known only infects the boot record and not on the computer's hard drive like most current virus. The virus is also known as Lahore, Pakistani, Pakistani Brain, Brain-A and UIUC will occupy unused space on the floppy disk that can not be used and will be hidden from detection. This will also disguise themselves by displaying bootsector on the disk is infected.
In 1987, the Lehigh virus was found at Lehigh University in the United States. Lehigh virus was the first resident file infector meori who attacked and took control of the executable file when the file is opened. Jerusalem virus also appeared around this time at the Hebrew University in Israel. Like the Lehigh virus, the virus Jerusalem also a memory resident file infector. It maintains a bug for re-infect already infected programs.

In March 1988, the first anti-virus software designed to detect and remove the Brain virus. Anti-virus immunization too floppy to get rid of Brian infection. At the same time, the Cascade virus emerged in Germany. Cascade Virus is a virus first encryption, which were coded and can not be changed or deleted.

Thus, in the late 1980s and early 1990s, which roam freely virus to infect a disk, etc. on your computer and cause more damage and it received much media attention. Magazines like Business Week, Newsweek, Fortune, PC Magazine, and Time began publishing an article about this destructive virus that wander around and demanded a solution to all these problems. In 1991, Symantec released a software Norton Anti-virus. Anti-virus software products from IBM, McAfee, Digital Dispatch and Iris.

Several years ago, in 2000, the ILOVEYOU virus launched a worldwide catastrophe. Virus made in the Philippines has been sent via email and spread throughout the world in one day infect 10 percent of computers connected to the Internet and causing damage losses $ 5.5 M. Therefore, the virus is still causing trouble even today. It is difficult to determine the reason for all this action and why the virus makers create computer viruses. Some do it for their personal profit, for research projects, pranks, vandalism, etc., while others want to help make improvements in the program.