What is a Virus?

Computers and Viruses
What is a Virus?


  • A computer virus is a way of describing a computer programme that has been written specifically to cause damage to your PC. In essence, it is a piece of software that is written to cause as much havoc as possible.

 Types of Viruses

  • Resident Viruses
  • Direct Action Viruses

  • Overwrite Viruses
  • Boot Viruses
  • Macro Viruses
  • Directory Viruses
  • Trojans or Trojan Horses
  • File Infectors
  • Companion Viruses
  • Fat virus
  • Worm
  • Logic Bombs
  • Polymorphic virus

How does a Virus Attack Computer
It has the ability to self replicate, and can lead to negative effects on your system and most importantly they are detected and eliminated by antivirus for example PSW Bug bear.
Companion Viruses
Once they get into the system they accompany the other files that already exist. In other words they wait in memory until a file is run for example stator.
Boot Virus
This type of Virus affects the boot sector of a floppy hard disk for example Polyboot.B 
How to Protect Your Computer

  • Use a Internet firewall
  • Visit Microsoft Update to verify your settings and check for updates.
  • Never open an E-mail attachment from someone you don’t know.
  • Avoid opening an E-mail attachment from someone you know, unless you know exactly what the attachment is. The sender may be unaware that it contains a virus. 


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