Abstract Computer viruses reproduce and spread from computer to computer through storage medium and network having a detrimental effect, such as system corruption and/or data destruction. It is very difficult to prevent every computer from being attacked by viruses. Virus infects computers and other storage devices by replicating themselves in to a file and other executable programs. This paper discusses types of computer virus as well as the prevention and detections technics of computer viruses. It recommends that proper awareness of the virus attack, sensitizing the users, about suspicious website’s, unnecessary downloads from untrusted websites, the purchase of licensed software, proper security implementations and the regular update of computer applications as well as the operating system as some measures to avoid these viruses attack.

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