This document discusses computer viruses and antivirus software. It begins with a brief history of viruses, noting the first virus called "CREEPER" in 1971. It then defines computer viruses and explains how they can spread and the types of damage they can cause. The document also discusses why some programmers create viruses, the signs of virus infection, common virus types like spyware and ransomware, how antivirus software works to detect and remove viruses, and tips to protect systems like installing antivirus and updating it regularly.

1. COMPUTER VIRUS AND ANTI VIRUS

2. ABOUT MYSELF
NAME: BOITUMELO MOKEMANE
bmokemane4@gmail.com
LESOTHO COLLEGE OF EDUCATION THABA-TSEKA
CAMPUS

3. HISTORY OF VIRUS
Viruses have evolved over the years. First computer
virus was called ‘CREEPER’, this program has been
designed not to damage the computer, but only to
display a message. It was invented in the early
1971 by Bob Thomas. Since then, millions of
viruses have been invented.

4. WHAT IS COMPUTER VIRUS?
Computer virus is a small software or code that can cause
damage to data and software on a computer.
Virus is a malicious program that is able to attach itself to
executable program that is able to spread from one
computer to another and cause damage and destruction.

5. WHAT A COMPUTER VIRUS
DO.
 Virus makes copies of itself and try to carry harmful task
written in its program.
A virus tries to take control of computer system at the
opportunity available.
This process can happen so quickly that the user is not
aware of the presence of a virus in computer.

6. WHY DO PEOPLE CREATE
COMPUTER VIRUSES?
SOME PROGRAMMERS CAN MAKE A VIRUS TO:
1. To take control of a computer and use it for specific tasks.
2. To steal sensitive information like credit card numbers,
passwords, personal detail and data.
3. To steal money.
4. To prove ones skill or for revenge purposes.
5. To disable a computer or network.

7. HOW DO VIRUSES SPREAD?
COMPUTER VIRUSES CAN SPREAD IN THREE WAY
1. From removable media.
2. From downloads off the internet.
3. From e-mail attachments.1

8. SIGNS OF VIRUS INFECTION
Unexpected pop-up windows.
Slow start up and slow performance.
Crashes and error messages.
Security attacks.

9. TYPES OF COMPUTER VIRUSES
THERE ARE MANY TYPES OF COMPUTER VIRUS, BUT I WILL
ONLY DISCUSS THREE:
Spyware is a type of malware installed on computer to
collect information about users without their knowledge.
Worm is a self-replicating virus that does not alter files
but resides in the active memory and duplicates itself.
Ransomware locks down the computer and threaten ton
erase everything unless a ransom is paid to its owner.

10. ANTI-VIRUS
Antivirus software is a computer program that identify
and remove computer viruses, and other malicious
software like worms and Trojans from an infected
computer.
Also an antivirus software protects the computer from
further virus attacks.

11. HOW AN ANTI-VIRUS WORKS?
The antivirus software examines each and every file in a
computer and examines its content with the virus
definitions stored in its virus dictionary.
A virus dictionary is an inbuilt file belonging to an
antivirus software that contains code identified as a virus
by the antivirus authors.

12. HOW TO PROTECT SYSTEM
AGAINST VIRUS?
Install a good anti-virus software on the computer.
Update anti-virus regularly.
Be careful while downloading files or programs from the
internet.
Always scan floppies, CDs, flash drives before using
them.
Do not use pirated software.
Turn on firewall of computer operating system.

13. CONCLUSION
It is important to scan files and media from an outside
source before opening them and use of antivirus software
that is up to date to protect data and computer devices.

14. LIST OF REFERENCES
https://www.Microsoft.com/security/pc-security/virus-
whatis.aspx
http://www.allbusiness.com/how-do-comtuter-viruses-
spread-1329-1.html
https://www.youtube.com/watch?v=pMBoq-IL3us
https://www.technibble.com/why-do-people-create-
computer-viruses/
https://en.Wikipedia.org/wiki/Computer_virus