2. 1. DEFINITION OF COMPUTER VIRUS
2. TYPES OF COMPUTER VIRUSES
3. EXPLANATION OF COMPUTER VIRUSES
4. DEFINITION OF COMPUTER ANTI-VIRUS
5. TYPES OF COMPUTER ANTI-VIRUSES
6. EXPLANATION OF ANTI-VIRUSES
7. TOP FIVE COMPUTER ANTI-VIRUSES

3. A computer virus has been defined as a set of
computer instructions that reproduces
itself and it may attach to other executable
code.
Usually this code is a short program that
may either embed in other code or stand on
it's own.
In essence, this computer program is
designed to infect some aspect of the host
computer and then copy itself as much and
as often as it has the chance.

4. COMPUTER
VIRUSES
BOOT
SECTO
R
VIRUS
FILE
INFECTIO
N VIRUS
MULTIPART
EMAI
NETWORK
ITE
L
VIRUS
VIRUS
VIRUS
MACR
O
VIRUS

5. BOOT VIRUS:
Viruses that aim at the boot sector of a hard drive are infecting
a very crucial component of the boot process.
Examples, Polyboot.B and AntiEXE.
FILE INFECTION VIRUS:
These infect executable program files, such as those with
extensions like .BIN, .COM, .EXE, .OVL, .DRV (driver) and
.SYS (device driver).
Examples, Sunday and Cascade.
MULTIPARTITE VIRUS:
Viruses that are both a file virus and a boot sector virus. They
enter the computer via various sorts of media and then embed
themselves in the system memory. They then go into the hard
drive and infect the boot sector. Examples, Invader, Flip, and

6. NETWORK VIRUS:
A virus that is especially made for networks is uniquely created
to quickly spread throughout the local area network and
generally across the internet as well. Examples , Christmas
tree and wank worm.
EMAIL VIRUS:
A e-mail virus is one of those types of computer viruses that is
generally a macro virus and it will multiply itself by seeking out
the other contacts in a e-mail address book.
Examples , ILOVEYOU and Melissa.
MACRO VIRUS;
A macro virus is a new type of computer virus that infects the
macros within a document or template. When you open a word
processing or spread sheet document, the macro virus is

7. Antivirus software is used to
prevent, detect, and remove malware and
other computer viruses. Anti virus software
systems detections involve searching for
known malicious patterns in executable code.
It is possible for a user to be infected with
new viruses that have no sign or symptoms or
existence.

9. CONVENTIONAL DISK SCANNERS:
This is the standard virus check program. It is run when the user
requests it, and it scans the contents of the disks, directories or
files that the user wants, for any boot sectors and/or files that
contain viruses that it recognizes, based on the virus description
information in its virus definition files.
MEMORY RESIDENT SCANNERS:
Some antivirus software now comes with a special program that
sits in the background while you use your PC and automatically
scans for viruses based on different triggers.
START UP SCANNERS:
Antivirus products often come with a special program that is
designed to be run every time the PC is booted up.
INOCULATION:
This is a totally different approach to virus detection. Instead of
looking for the viruses themselves, this technique looks for the
changes that the viruses make to files and boot sectors.

10. 1.
2.
3.
4.
5.
AVG.
McAFEE.
NORTON (SYMANTEC).
KASPERSKY.
AD AWARE.