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Saturday 7 December 2013

HOW DO VIRUSES AFFECT OUR COMPUTER SYSTEM

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Today we shall look at HOW DO VIRUSES AFFECT OUR  COMPUTER SYSTEM
Viruses will affect your PC in 4 different ways . . .

Last time We Discus on This Topic Extensively on How to Protect our computer against virus attack you can still catch up by clicking here.
  below is the list of how Virus can attack our PC
1) The Boot Sector: The boot sector is where your operating system files reside on your floppy
or hard disk. A virus will go to that location on your disk and corrupt these
files (IO.SYS, MSDOS.SYS, and COMMAND.COM) so that your PC will
NOT boot up as expected.
Must Read Article: How To Protect My PC Against Virus Attack

EXAMPLE: the STONED virus.
2) The File Allocation Table: The File Allocation Table (FAT) is a list of all the files on your floppy or
hard disk, and where the files are physically located on the disk. A virus
will corrupt the FAT so that you cannot locate or access your files.
EXAMPLE: the CASCADE virus.
3) The Partition Table: The partition table on your HARD DISK tells MS-DOS how big your hard
disk is, and what percentage of it is used by MS-DOS. A virus can corrupt
your partition table, which wipes out ALL of your files in an instant.
EXAMPLE: the MICHELANGELO virus.
4) .COM and .EXE Files: Files with these extensions are EXECUTABLE files, which perform a
specific action. A virus can attach itself to one of these kinds of files and
corrupt the way it operates.
EXAMPLE: the 4096 virus

BASIC THINGS A GOOD VIRUS PROTECTION PROGRAM SHOULD DO

1) SCAN for viruses: A good program should be able to check your floppy and hard disks for
viruses, as well as the RAM of your computer, and detect the presence of a
virus in the 4 locations mentioned above.
2) CLEAN up the virus: A good program must be able to get rid of the virus it finds in any of the 4
places mentioned above; otherwise, it's useless.
3) PROTECT YOU from viruses: A good program must have the ability to load a piece of the program into memory
at boot-up time, to protect you from getting a virus in the first place. This type
of program is called a "Terminate-and-Stay-Resident" (TSR) program.


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