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A computer virus is small block of coded instructions to obtain control of PC’s CPU and directs it to perform unusual and often destructive actions. They are of types -
A worm is a destructive program that is designed to adulterate database either all at once or over a period of time. It is very similar to the logic bomb.
HOW DO VIRUSES SPREAD?
Viruses spread through floppies, e-mails, Internet downloads and other networks.
PREVENTIVE MEASURES AND TREATMENT
There are various things one can do to prevent viral infection in a computer system. These are