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2                Know about Computer Viruses















                                Your Aim

                                to learn about:

                                          What is a Computer Virus?
                                          How does a Computer get Infected with Virus?
                                           How do you know your PC has a Virus?
                                            How to Prevent from a Virus?

                                            Antivirus Software




                 You must have heard of viral fever. When we have
                 this fever, our body is  attacked  and infected by
                 viruses. Similarly, a computer may also be attacked
                 by viruses that can destroy the programs and files

                 saved in the computer. Such programs are known
                 as computer viruses.

                     WHAT IS A COMPUTER VIRUS?

                 A computer virus is  a program.  This  program can infect a system  and quickly

                 duplicate itself. The user of a computer may not even realise that the computer
                 is affected. Viruses normally infect just one computer, however, if that computer
                 is part of a network, the computer virus may spread to other systems much like a
                 human virus which transmits from one person to another. Some popular viruses

                 are Code Red, MYDoom and Melissa.
                 Harms Caused by Computer Viruses


                 Different viruses will affect your computer in different ways.
                         They can crash your hard disk.

                       They can destroy all or some of your data.
                         They decrease the processing speed of the computer.
                         They can reduce or block the memory of the computer or hard disk.



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