Virus

Virus
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 -

• BOOT INFECTORS
• SYSTEM INFECTORS
• GENERAL EXECUTABLE PROGRAM INFECTORS

WORMS
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

• Sharing of software so as to limit the information flow.
• Limit transitivity
• Limit functionality
• Use the scanner and virus remover
• Observe whether the working of computer system is slowing down
• Watch for unusually large sizes on program files
• Watch for unusual displays on the computer screen
• Make sure that there is virus protection software on local hosts, application and file servers.