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A computer virus is a computer program .It infects a computer and reduces the performance of the computer. It also damages the files saved in the computers. It spreads from one computer to another through local area network or Internet .It can also transfer through floppy disks, compact disks, DVD or USB drives. These viruses reduce the efficiency of the computers. An anti-virus program is software which detects these virus .This programs would have the ability to destroy them. free anti-virus download is available in the internet which are regularly updated .This programs would help to destroy the virus present in the system previously .It would also help in preventing new virus attack .