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General Virus Information A virus is a piece of software designed and written to adversely affect your computer by altering the way it works without your knowledge or permission. In more technical terms, a virus is a segment of program code that implants itself to one of your executable files and spreads systematically from one file to another. Computer viruses do not spontaneously generate: They must be written and have a specific purpose. Usually a …

…the infected applications is running. Turning off your computer or exiting the application removes the virus from memory, but does not remove the virus from the infected file or disk. That is, if the virus resides in a system file, the virus will activate the next time you start your computer from the infected disk. If the virus resides in an application, the virus will activate again the next time you run the application.