How to install software to prevent infection and detect viruses

Free antivirus software is available on the Internet, but much of it is not reliable enough to provide comprehensive protection or is not updated regularly to guarantee security.

Awful, but some free antivirus programs instead of protecting, download viruses, adware, spyware, or Trojans when you try to download and install them.

If it’s about money, the best option is to find a competitively priced security solution that offers a free trial so you can look at the software in action and understand how your computer will behave after it’s cleaned up before making the purchase decision.

The worst part about all of this is that although many threats are neutralized every day, new threats appear in their place now. This means that as long as there is an Internet, computer viruses will remain a problem.

Ignoring the problem, or counting on it not to affect you, is the right way to put your computer at risk, and therefore your family information and your peace of mind.

Detection level

If antivirus product X catches, say, 50% of all modern viruses that are currently active in the network, the product Y – 90%, and the product Z – 99.9%, then it is not difficult to calculate the probability in which case as a result of N attacks the computer will remain intact or, conversely, it will settle in some other malware. If the computer was attacked 10 times, the probability of “flying” for product X is almost guaranteed (99.9%), for Y is more than likely (65%), and for Z is very low – only 1%.

Unfortunately, not all anti-virus products that can be detected on store shelves or in the network provide protection close to 100%. Most products do not guarantee even a 90% level of protection! This is the main problem of anti-virus software today.

Problem number 1. The number and variety of malicious programs is steadily growing year after year. As a result, many antivirus companies simply can not keep up with this flow, they lose in the virus “arms race”, and users of these programs are not protected from all modern computer threats. Alas, products of far not all anti-virus companies it is possible to name really anti-virus.
Regularity and frequency of updatings

Antivirus should be updated regularly – since the activity of computer cybercriminals grows year after year, both the number of new malicious programs and the frequency of their occurrence increases. Antiviruses are not always able to stop new, previously unknown viruses and Trojan horses using proactive methods. For this reason, an antivirus must be able to react quickly to new malicious programs.

What does it mean? And exactly that probability to catch a new “criminal virus” is far not zero, and it is not excluded that in a network already tens, hundreds, and can, and thousands infected users. And if the new sample is a network worm, then the number of victims can go on millions. After all, the Internet is an extremely high-speed thing. I.e. it is necessary for the anti-virus companies to release instantly updates against all newly found viruses and Trojans. And that is the second problem.

Problem number two. The speed of distribution of modern malicious programs makes anti-virus companies to release protective updates as often as possible – to quickly cover their users from the newly discovered computer “beast”. Alas, far not all anti-virus companies are rather rapid. Often updates from these companies are delivered to users too late.
Correct removal of viral code and the consequences of infection

But suppose that the virus, despite all the filters installed, got into the system and settled in it, and the defending system not very vigilant anti-virus guards did not notice anything suspicious. Or the antivirus is installed by a lazy user or system administrator who is not in a hurry to download the next updates of antivirus databases. Sooner or later updates are delivered, and the virus is detected – but not defeated, because for the final victory you must carefully remove infected files from the system. The key word is “carefully”, and this is the next problem of anti-virus programs.

Problem #3. Removal of detected malicious code from an infected system. Often viruses and Trojans take special actions to hide the fact of their presence in the system, or embedded in it so deeply that the task of “digging it out” becomes quite nontrivial. Unfortunately, sometimes antivirus programs are unable to remove the virus code safely and without any side effects and fully restore the system’s operability.
Balance: performance or full protection?

Further, any software consumes computer resources. Antiviruses are no exception. In order to protect computers, antivirus programs need to perform some actions: open files, read information from them, open archives to check them, etc. And the more thoroughly files are checked, the more computer resources are consumed (it’s like an iron door: the thicker it is, the better it protects, but the harder it becomes to open and close, the more tons of metal it contains). The result is a balance problem: full protection or speed.

Problem #4. Reasonability of computer resources consumption. The problem is not solvable – as practice shows, all the most “high-speed” antiviruses are very much “holey” and pass viruses and Trojan programs like colander water. The reverse is wrong: not all “slow” antiviruses protect you well enough.
Compatibility of duplicate antivirus programs

In order to check the files “on the fly” and constantly protect the client computer, antivirus programs have to penetrate deeply enough into the system core, and to penetrate into the same areas.

Technically speaking, antiviruses should install system event interceptors deep inside the protected system and pass the results of their work to the antivirus “engine” to check intercepted files, network packets and other potentially dangerous objects.

Problem #5. Technological exclusivity, i.e. incompatibility of different antivirus programs with each other. In the vast majority of cases (with rare exceptions) it is impossible to install two different antiviruses on the same computer (to provide double protection) due to technical reasons, and they simply do not get along with each other.


  • Windows
  • Avast Free Antivirus
  • Tencent PC Manager
  • Panda Security Free Antivirus
  • Comodo Internet Security
  • Nano Antivirus
  • AVG Antivirus Free
  • Adaware Antivirus Free
  • Kaspersky Free
  • Bitdefender Free
  • Avira Free Antivirus (и Avira Free Security Suite)