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Presentation on computer viruses
1. A Presentation On Computer Viruses
Name:- Nitish Xavier Tirkey
F.Y.BCA
Date:- 4th October, 2010
2. Flow of presentation
• Introduction
• Symptoms
• How does it spread
• Types of Computer Viruses
• Prevention and Cure
• Antivirus Software
• Conclusion
3. Introduction
• Computer viruses are a type of software program that,
like a biological virus, reproduces and spreads itself
• Some virus may display only 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 crash the system
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 runs out of space.
• The computer does not boot.
5. How does it spread
• 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
6. Types of computer viruses
• 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
7. Preservation and cure
• 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
