The document discusses computer viruses, including their symptoms, how they spread, types of viruses, prevention and cure methods, antivirus software, and conclusions. Computer viruses are software programs that replicate and spread like biological viruses by attaching to other program files. Viruses can slow down systems, erase files, crash hard disks, and more. They typically spread via infected files on external drives or diagnostic disks from repair technicians. Prevention methods include installing and regularly updating antivirus software, being cautious of email attachments, and only installing registered software. [/SUMMARY]

1. BY: Muhammad Yaqoob Sadiqe
Roll no. 03
B.com(hons)II regular

2. Flow of Presentation
 Introduction
 Symptoms
 How does it spread
 Types of computer viruses
 Prevention and Cure
 Antivirus Software
 Conclusion

3. INTRODUCTION
 They can also erase files or even format your floppy
or harddisk and crash the system
 Computer viruses are a type of software programe
that, like a biological virus, reproduces and spreads
itself
 Some virus may display only a message on the
screen other may slow down the pc

4. SYMPTOMS
 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 run out of space
 The computer does not boot

5. How does it Spread
 Computer viruses spread by atteching themselves to
other computer programe files
 When you exchange a file or pen drive with a viruses,
the virus spreads from one computer to the another
 Viruses also spreads when a computer engineer come
to repair your system and put his/her diagnostic disks
in your pc

6. Type of computer viruses
 BOOT VIRUSES
 POLYMORPHIC VIRUSES
 MACRO VIRUSES
 WORMS VIRUSES
 TROJANS

7. Preservation and Cure
 Install an antivirus programe
 Regularly update you programe
 Open email attachment files only if you are expecting
the attached files, or the sender is known and had
confirmed sending the file
 Try to avoid download any install software from the
internet
 Install only registered copies of soteware on the
system

8. Antivirus Software
 Norton Anti-virus
 Macfee
 Avast
 Quick Heal
 Panda
 AVG

9. Conclusion
 For better and safe computation anti-virus software
should be installed and be helpful for global network
system freely

10. By: Muhammad Yaqoob sadiqe
Roll no. 03
B.com(hons)II regular
Student of University Of Sargodha