Boost PC performance: How more available memory can improve productivity
Computer viruses
1.
2. S.NO CONTENTS
1 Introduction
2 Symptoms
3 How Does It Spread?
4 Types of Computer Viruses
5 Prevention and Cure
6 Antivirus Software
7 Conclusion
3. 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
Computer Virus also work on to make
the system slow
4. The computer
system does not
reboot
The size of
available free
memory reduces
The hard disk runs
out of space
The computer
system becomes
slow
Letters looks like they are falling
to the bottom of the screen
5. When you exchange a file or
pen drive with a virus, the
virus spreads from one
computer to the another
Computer viruses
spread by
attaching
themselves to
other computer
program files
It also spreads
when a Computer
Engineer comes to
repair your system
and puts his
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
Trojans:- A Trojan is a program file that
claims to do something but it actually
does something that is not required
Worms:- Worms are program that replicate
and spread to other system
Macro viruses:- Macros are blocks of code
written to automate frequently performed
tasks and embedded in a program file
