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Line 1: − A '''computer virus''' is a piece of unauthorized software added to a computer which automatically spreads itself to other computers. Some viruses do malicious things, such as erasing files or copying sensitive information (like passwords and credit card numbers). + − − ==Process of transmission== − − There are three main ways a virus is transmitted. − − #Automatic replication. When you run an infected program, the virus also runs, searching your computer for other programs to infect. − #By email. When email software is configured to run programs attached to messages, the virus asks your email software to send it to recipients in your address book. − #Misleading advertising. A "Trojan Horse" is a program which seems useful, but contains a virus. The main program may or not perform as advertised, but the distributor knows it is infected. − − A virus which infects networks is called a "worm". − − A Trojan Horse virus typically does not replicate itself but is spread when you copy the program. − − ==Anti-virus tactics== − − Configuring your email software so that it never runs attached programs is an easy way to stop email viruses. This should be the default setting, especially for corporate systems. − − Virus scanning software is available from Norton, Symantec and other companies. The software detects the virus and removes it from infected programs. − − It is also prudent to avoid trying out free games and animations available on the Internet. Reputable software companies go to great lengths to ensure virus-free software, so stick to these. Or else, use a separate computer for trials. − − ==Terminology== − − Discussion of the virus problem is sometimes hampered by the terminology used by purists, who distinguish between such varieties as "[[Computer worm|worm]]", "[[Trojan Horse]]", etc. But the generic term for unwanted software that infects your computer is "virus". − − ==See also== − *[http://www.howstuffworks.com/virus.htm "How Computer Viruses Work"] − − [[Category:Software]][[Category:Computers]]
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