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What is Computer Virus?. A computer virus can be defined as an executable program, that is capable of infecting other computer programs by modifying them to include a copy of itself.

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What is Computer Virus?

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What is computer virus

What is Computer Virus?

  • A computer virus can be defined as an executable program, that is capable of infecting other computer programs by modifying them to include a copy of itself.

  • Example, just the way people can spread the common cold by being in contact with other people. Similarly, a computer virus when comes in contact with other programs, it infects them. By infecting programs, it could damage your computer by destroying important files, corrupting data by slowing down the computer, interrupting or unexpected closing of important programs.

Evolution of security challenges

Evolution of Security Challenges

Target and Scope of Damage

Time from knowledge of vulnerability to release of exploit is shrinking







  • Next Gen

  • Infrastructure hacking

  • Flash threats

  • Massive worm driven

  • DDoS

  • Damaging payload viruses and worms


  • 3rd Gen

  • Network DoS

  • Blended threat (worm + virus+ trojan)

  • Turbo worms

  • Widespread system hacking



  • 2nd Gen

  • Macro viruses

  • E-mail

  • DoS

  • Limited hacking

  • 1st Gen

  • Boot viruses





First viruses in pc history

First viruses in PC history

  • The computer virus has completed 25 years.

  • 'Elk Cloner', the first computer virus which started circulating in 1982

  • "Brain" was the first virus to hit computers running Microsoft's popular operating system DOS in 1986. Written by two Pakistani brothers, Basit Farooq Alvi and his brother Amjad Farooq Alvi, the virus left the phone number of their computer repair shop. BusinessWeek magazine called the virus the Pakistani flu

How to make your pc secure at work home

How to Make Your PC Secure at Work & Home?

  • Make sure your computer has good passwords

  • Patch your machine regularly

  • Install an anti-spyware product

  • Use an anti-virus product and update it regularly

  • Use a router-based firewall or install a personal firewall

  • Know what is running on your system

  • Use good internet practice

Automatic updates of ms windows operating systems

Automatic Updates of MS Windows Operating Systems

  • All Windows OS patches can be accessed here:


  • You can set up your Microsoft operating system to check for updates automatically

    • Using Windows 2000 and Windows XP:

      Click on the Start button > Control Panel > System

    • Using Windows 98 and Me:

      Click on Start > Control Panel > Automatic Updates

Automatic updates of ms windows operating systems1

Automatic Updates of MS Windows Operating Systems

  • Using Windows 2000

    or XP, select System

    then click on the

    Automatic Updates tab

  • Be sure the check box

    near the top is checked,

    then select the radio button

    which suits you.

  • Using Windows 98 or Me

    select the Automatic Updates

    icon (this next screen

    will differ slightly)

Internet banking security

Internet banking Security

  • Never respond to emails that request personal information

  • Keep your password top secret and change them often

  • Never use cyber cafes to access your online accounts

    • may be infested with viruses that can capture and transmit your personal data to fraudsters.

  • Keep your computer secure

  • Check the website you are visiting is secure

    • If the address bar is visible, the URL should start with ‘https://’ (‘s’ for secured) rather that the usual ‘http://’.

    • look for a lock icon on the browser's status bar

  • Validate the SSL Certificate

    • If you are in any doubt, click on the lock icon at the bottom of the secured page. This opens up a new window, displaying the SSL certificate information

    • Ensure that there is no red cross mark preceding the title ‘Certificate Information’.

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