Computer viruses are a type of software
program that, like biological virus
reproduces and spread itself
Some Virus may display on a message
on the screen ,others may slow down the
They can also erase files or even format
your floppy or hard disk and the crash
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.
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
Viruses also spreads when a Computer
Engineer comes to repair your system and
puts his/her diagnostics disks in your PC
Boot viruses:- The boot virus copies the virus code in the
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
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
Install only registered copies of software on the system