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1. Computer Virus and
Antivirus

2. Types of Computer Viruses

3. Types of Computer Viruses
• Boot Viruses – Copies the virus code in the boot
sector of the disk, this ensures that the virus is
always executed and loaded in the memory when the
system starts
• Polymorphic Viruses – Infects the system and change
its signature before infecting the next system
• Macro Viruses – A macro having the virus code is
executed, it infects the files on the system
• Worms – Programs that replicate and spread to other
systems and reside in system memory and affects e-
mail system

4. Types of Computer Viruses
• Trojans – Program file that claims to do something
but does something that is not required. Allows
remote users and hackers to gain unauthorized
access to your system
• Spywares – Stores personal information and
surfing details and send them to its web site
without informing the user. Many spywares get
installed automatically as a free download while
installing an application

5. Spyware
The following problems indicate that a spyware or
other unwanted software is installed
on your computer:
• Unwanted advertisements pop-up even when not connected
to the Web
• Web browser settings are changed automatically
• Unable to remove unwanted toolbar from the browser
• Computer performance slows down
• Computer crashes very frequently
Spywares can be removed from the system by installing
some kind of anti-spyware program. The user can
also use software tools are available from McAfee,
Ad-Aware and Symantec

6. Installing Antivirus Software and show
how to install
• Install an antivirus software to protect PC from
viruses
• Software such as Panda AntiVirus, Norton AntiVirus,
or PC-cillin can be used
• Check the reliability and the features offered by
AntiVirus software before installing it on the system
• Install Norton Antivirus 2006 software from the CD
to protect the system

7. Working with Antivirus Software –
I and show how to configure
• Norton Antivirus 2006 software protects and scans
your system for viruses
• Scans Web pages displayed in the browser
• Cleans viruses in incoming and outgoing mails
• Removes spyware software that slows down the
system

8. Working with Antivirus Software
• Configuring
– Enables to set the level of protection
– Higher level of protection increase system
security
• Using Live Updates
– Connects to the Web server, downloads and
updates files required to identify and delete
latest viruses

9. Working with Antivirus Software
• Manual Update of AntiVirus
– Virus definitions are available for download from the
Website
• Scanning Drives
– Checks the system for virus infected files
– Software enables to select the drives, folders, or files
to scan
• Using a Fix Tool
– Used to alter damage done by viruses
– Some files may not be recoverable even after running
the Fix Tool

10. Preventing Virus Attacks
• Viruses can cause
damage to your system
• AntiVirus software
protects your system
from viruses
• Protect your system by
preventing the viruses
from getting into your
system