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Computer virus

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  • 1.  Computer viruses are a type of software program that, like biological virus reproduces and spread itself  Some Virus may display on a message on the screen ,others may slow down the pc  They can also erase files or even format your floppy or hard disk and the crash the system
  • 2.  Letters looks like they are falling to the bottom of the screen.  The computer system becomes slow.  The size of available free memory reduces.  The hard disk runs out of space.  The computer does not boot.
  • 3.  Computer viruses spread by attaching themselves to other computer program files  When you exchange a file or pen drive with a virus, the virus spreads from one computer to the another  Viruses also spreads when a Computer Engineer comes to repair your system and puts his/her diagnostics disks in your PC
  • 4.  Boot viruses:- The boot virus copies the virus code in the boot sector  Polymorphic viruses:- They are coded in such a way that they infect a system and change their signature  Macro viruses:- Macros are blocks of code written to automate frequently performed tasks and embedded in a program file  Worms:- Worms are program that replicate and spread to other system  Trojans:- A Trojan is a program file that claims to do something but it actually does something that is not required
  • 5.  Install an Antivirus software  Regularly update the program  Open email attachment files only if you are expecting the attached files, or the sender is known and has confirmed sending the file  Try to avoid downloading and installing software from the Internet  Install only registered copies of software on the system
  • 6.  Norton Anti-Virus  MacAfee  Avast  Quick Heal  Panda
  • 7.  For better and safe computation anti- virus software should be installed and be helpful for global network system freely.