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What is an antivirus? How does it work?

Antivirus is a computer program designed to protect and preserve the integrity of a computer’s data against harmful programs (viruses, worms, macro-viruses, etc.). It therefore makes it possible to search and eliminate computer viruses.

Antivirus detects and neutralizes viruses by scanning files on hard drives (and USB sticks, CDs, DVDs etc.): 

The antivirus scanner examines your computer automatically (depending on the parameters chosen) or on request. It can scan a file, a folder or all the files on your disk. 

A full scan requires a lot of resources and time, but it is advisable to do it from time to time. 

Once virus is detected, viruses are neutralized: 

  • The antivirus removes the virus from the infected file or removes the infected file directly (be careful, this can have unfortunate consequences if the file is an important part of your computer. For example, if this is your mailbox, you lose the emails it contains). 
  • The antivirus can also place the infected file in quarantine pending a version capable of disinfecting it. In this case, it is moved to a container that only the antivirus is able to open (a doubleclick will never activate the malicious program).

Virus detection methods:

They vary from one software to another: 

  • Virus signatures (directory to be updated regularly to counter new virus creations); 
  • Heuristic analysis looks for viral behavior in programs. It detects unknown malicious programs (from its signature database); 
    • Behavioral review monitors the behavior of active software through file access; 
    • Integrity checks to detect changes to files on disk; 
  • Multi-level generic detection searches for polymorphic viruses. 

If your antivirus does not allow the above steps and/or the above steps do not succeed, this may mean that the virus cannot be deleted. In this case, it is recommended to reinstall your operating system (either format it) and possibly to contact Antivirus Support Helpline Number +1-844-235-2085

Some signs indicate a virus or a harmful program on your computer

Do not hesitate to check with an up-to-date antivirus if: 

  • Your computer is slow and / or stops responding; 
  • It stops and restarts at close intervals; 
  • Programs have settled on their own without your permission; 
  • The system does not restart anymore; 
  • Suspect windows usually in English are displayed on the screen; 
  • You have lost your personal files. All of these symptoms usually reveal the presence of a virus (although they may also be hardware or software problems).  

If your computer is infected, follow these tips:

  • The first rule of thumb is to immediately install an antivirus and ensure that its virus signature database is up-to-date; 
  • Contact reliable and professional AVG Antivirus Customer Service Number
  • Depending on the type of virus present, we recommend that you isolate your computer from the Internet or a computer network to prevent the spread of the virus to other computers. Indeed, there are Trojans like viruses that perform remote downloads. 
  • Make selective backups of important and healthy files to an external hard drive, for example, 
  • Avoid access to secure sites like your bank or personal sites. A virus could intercept your identifiers and transmit them remotely. 
  • Launch an antivirus control manually on all hard disks of the computer. Indeed, viruses could “play hide-and-seek” with the antivirus. 

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