Skip to main content

What is Computer Virus

What is Computer Virus


What is Computer VirusWhat is Computer Virus - Virus is an executable program which attaches itself to a program or file enabling it to spread from one computer to another, leaving infections as it travels. Almost all viruses are attached to the executable file and it will affect only when these executable files are opened or executed. The virus is spread from one computer to another by sharing infected files or sending emails with viruses as attached in the emails.

How we get to know a virus has attacked our computer?


  1. An annoying message appearing continuously on computer screen.

  2. Reduced memory or disk space instantly.

  3. Automatic modification of data.

  4. Files overwritten or damaged

  5. Hard drive erased



If we see any of the errors prompting on our computer screen then we get to know our system gets affected with computer virus.


Types of Computer Viruses



  1. File Virus – Major attacks are due to these types of virus. This virus attaches itself to the program files.

  2. Boot Sector Virus – These viruses infect floppy and hard drives. In this case, the virus program is loaded before the operating systems.

  3. Macro Virus – This type of file infects documents. This type of virus uses an applications own macro programming features to distribute themselves. It does not affects programs but documents

  4. Virus Hoax – The category of virus fall under imaginations to the public.



What is the difference between Virus, Worms and Trojan Horses


All the three are malicious program files that damage the computer, but they are totally different according to the conceptions.


What is a Worm?


A worm is a program similar to virus and is considered to be sub class of Virus. It travels from one computer to another without human interventions. It took the advantage of transport features of files and information. The biggest danger with the worm is its capability to replicate itself. A single worm can create hundreds or thousands of copies of itself, creating huge devastating effect.


Example – Blaster worm – the worm has been designed to tunnel into the system allowing malicious users to control the computer remotely.


What is a Trojan Horse?


The Trojan Horse tricked program by which a legitimate source enters someone computer backdoor giving malicious users access to computer system. This type of malicious program hack confidential or personal information from someone's computer system. Trojan Horse do not reproduce by infecting other files nor do they self replicate.


How to Remove Virus from our Computer?


There are some antivirus software which is available on market, which protects our computer from Virus as well as Trojan and Worms. There are two main ways of virus removal.



  1. Use of Heuristic Algorithms – Heuristic detection is generic detection designed to detect new or previously unseen malware. So it can be useful for detection and prevention of new malwares.

  2. Using Virus Signature and definition – During a virus scan, antivirus software compares the content on a computer against its virus definition database. The virus definition database, enables antivirus software to effectively detect viruses upon the discovery of any of the code included in the virus definition database.



This is all about What is Computer Virus which we must know in order to keep our computer in correct manner.


Popular posts from this blog

Fix Windows could not find a driver for your network adapter error

Fix Windows could not find a driver for your network adapter error


A Computer run smoothly with the coordination of Software & Hardware. In the absence of any one it will not run at all. Software being the Master utilizes each hardware attached to the System. And each hardware is operated with the help of Device Drivers installed in it. Operating System (OS) uses these device drivers to control & utilize each hardware when needed. Each hardware connected to the system must have their own Device Driver installed. A device driver is a program to initiate a hardware when required by Operating System.




Suppose, you want your PC to connect to the Network, it can only be possible when your PC has network related Device Driver. These Device Drivers are easily downloaded from Manufacturer Websites. In this article we focus on Network related problem. Suppose, your PC not obtaining Network connectivity. And each time you are getting an error message saying "Windows could not find a d…

Fix This Site Can’t Be Loaded from The Cache Chrome Error

Fix This Site Can't Be Loaded from The Cache Chrome Error


This Site Can’t Be Loaded from The Cache - Today, there are several browsers available with extensive features on it. Each browser has its own importance and working principle. Some of the popular browsers available online are Google Chrome, Mozilla Firefox, Opera Mini, Internet Explorer, UC Browser, Safari, Microsoft Edge, Swift fox etc. The popularity of these browsers depends upon the features available in it.

Among them Google Chrome is the newest and mostly used browser around the world. Holding lots of feature make it more complex and hence more prone to errors. The types of error come up with the level of complexity of the program. If you are Chrome user and facing one of such error then read the full article. In this article, we focus on an error saying "This site can't be loaded from the cache". The explanation included with this error will be "The saved (cached) copy of this site was unreadable&qu…

Change Facebook Profile Picture Leaving All Unknown

Change Facebook Profile Picture Leaving All Unknown


Change Facebook Profile Picture Leaving All Unknown - Today, we spend lots of time in Social media platforms such as WhatsApp, Facebook, Instagram, Skype, YouTube, Twitter etc. We love to share Images & Videos with our friends via these platforms. These applications are largely used on Smartphones. We need to download concerned apps from inbuilt software, Play Store in Android Platform.


After downloading the App, we create an ideal account with a profile picture. We join the network by sending friend request. When request is accepted, we are added to such a community. In this article we take a close look on Facebook. Facebook is vastly used all around the world. Two person residing miles away can also share their views easily.

Change Facebook Profile Picture Leaving All Unknown

Whenever we open Facebook, lots of Images & Videos are seen with gentle scroll. In this article we focus on an interesting thing say Profile Picture. In F…