An introduction to computer viruses

AN INTRODUCTION TO COMPUTER VIRUSES In this tutorial, I am going to explain what are computer viruses, how does it spreads, and what are the effective ways to protect your PC against these viruses. Use the recommended antivirus software and make your PC smile.

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What are computer viruses?

 It is a computer program that can replicate itself and spread from one computer to another. Some virus may display only a message on the screen, others may slow down the PC. They can also erase files (corrupt or delete data on your computer) or even format your floppy or hard disk and crash the system. It might use your email program to spread itself to other computer.

History of computer viruses:  The first computer virus was called “creeper”.  It was invented in the early 1970’s.  Since then, millions of viruses have been invented.

The effect of viruses:

 Damage your files leading to Loss of Personal data  Slows down your PC by eating into the RAM and processor time  Uses up internet bandwidth leading to frustration when surfing and checking emails  Trojans end up taking control of your PC which may then be used for hacking, terrorist emails, spamming

How does it spread?

 Computer viruses spread by attaching themselves to other computer program files.  When you exchange a file or pen drive or an infected USB flash drives with a virus, the virus spreads form one computer to another.  Trojans in Freely available software from untrusted sites  Clicking on links in suspicious emails.  Clicking on links at untrusted sites especially those catering to lotto, adult content, free downloads for songs, movies, games and TV shows.

The antivirus:

 An antivirus is a computer program which prevents against, detects and removes viruses  It helps to protect computers from both common and rare computer viruses  Also protect against 

Worms

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Spyware

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Trojans

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Corrupt adware

Which one to use:  There are numerous anti viruses in the market  Both paid options as well as free options  In this tutorial I am choosing Avast Antivirus Software How an antivirus works?

 Using dictionary approach: 

The antivirus software examines each and every file in a computer and examines its content with the virus definitions stored in its virus dictionary.

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A virus dictionary is an inbuilt file belonging to an antivirus software that contains code identified as a virus by the antivirus authors.

About Avast:

 Avast Internet Security 2016 offering one of the best anti – virus programs. Avast internet security is preferred mostly because it is available in both paid and crack versions. It scans all the illegal file on your PC/laptop and if it detects some issue it worked fully and safes whole system.

System requirements:  Window 10, 8.1, 8, XP, SP3, Window 7 and Vista supports this Avast internet security 2016.

Conclusion:

 There are lots of viruses in the world and new viruses are coming up every day. There are new anti – virus programs and techniques developed too. It is good to be aware of viruses and other malware and it is cheaper to protect your environment from them rather than being sorry.