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A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. The original may modify the copies or the copies may modify themselves, as occurs in a metamorphic virus.

A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or carrying it on a removable medium such as a floppy disk, CD, or USB drive. Additionally, viruses can spread to other computers by infecting files on a network file system or a file system that is accessed by another computer.

Viruses are sometimes confused with computer worms and Trojan horses. A worm, however, can spread itself to other computers without needing to be transferred as part of a host. A Trojan horse is a file that appears harmless until executed. In contrast to viruses, Trojan horses do not insert their code into other computer files.

Many personal computers are now connected to the Internet and to local-area networks, facilitating their spread. Today's viruses may also take advantage of network services such as the World Wide Web, e-mail, and file sharing systems to spread, blurring the line between viruses and worms.

Furthermore, some sources use an alternative terminology in which a virus is any form of self-replicating malware. There are many viruses operating in the general Internet today, and new ones are discovered every day.

They typically take up computer memory used by legitimate programs. As a result, they often cause erratic behavior and can result in system crashes.

In addition, many viruses are bug-ridden, and these bugs may lead to system crashes and data loss.

Make sure your anti virus protection is kept up to date and if you are not sure contact ComputerMania, will be happy to advise you.

Most total computer security programs can do the following but check with your local supplier before making a purchase.