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EFFECTS OF VIRUS

                     Files become corrupted or the content of the files gets deleted.
                     A virus can damage or destroy the operating system.
                     A virus can reduce memory space.


                 TYPES OF COMPUTER VIRUS
                 There are various types of computer viruses that infect the computer in different ways. The
                 most commonly known categories of computer viruses are:


                 Program File Virus
                 A program file virus, also known as the file-infecting virus is a type of computer virus that

                 infects executable files (program files such as .exe, .com, .sys, etc. files) to make them
                 unusable or damage permanently. When an infected program file is executed, the code of
                 the virus also gets executed.


                 Boot Sector Virus
                 A Boot sector virus is one of the most hostile types of computer viruses that infect the boot

                 sector or the Master Boot Record (MBR) of hard disks or floppy disks. Once a computer
                 system is infected by a boot sector virus, any disk connected to the computer will also be
                 infected. The most commonly known boot sector viruses are Michelangelo and Stoned.


                 Macro Virus
                 A macro virus is a type of computer virus that is primarily designed to infect a specific type
                 of document such as Word or Excel files. If we open a macro virus-infected document, the

                 macro virus gets active in the memory and starts infecting other documents. Sometimes,
                 a macro virus sends itself by attaching with an e-mail to the people in the user's address
                 book. Melissa and Bablas are the most commonly known macro viruses.


                 E-mail Virus
                 An E-mail virus is a type of computer virus that transmits from one computer to another
                 through e-mail messages. Some e-mail viruses can also be transmitted as an infected
                 attachment with the e-mail message. It gets active in the memory when a user opens an

                 infected e-mail or attachment. It sounds very simple but an e-mail virus can erase files,
                 destroy information and cause computer crashes.




                          WORMS
                 A worm is a self-propagating program that works without human intervention. It is a kind

                 of malware that uses a computer network to send copies of itself to another computer on
                 the same network.



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