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2.  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 pc
 They can also erase files or even format
your floppy or hard disk and the crash the
system

3.  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.  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.  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.  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

8.  Norton Anti-Virus
 MacAfee
 Avast
 Quick Heal
 Panda

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