Computer viruses are self-executing, replicating programs written specifically to change the way a machine works, without the knowledge or permission of the operator/owner. Viruses are so called because they behave in a similar way to biological viruses. Just as biological viruses pass from person to person, replicating themselves as they go, computer viruses pass from computer to computer. Unlike most biological viruses, however – computer viruses are entirely man made.
Viruses can impair and seriously damage your computer by, amongst other things; executing random text, audio and video messages, draining memory, deleting files, corrupting programs – even reformatting (or erasing the contents of) your hard disk. At best, the less destructive viruses are annoying and will slow the infected machine up (because of the drain on memory), often resulting in crashes and other unpredictable behaviors which can ultimately result in loss of data.
I want to say that the programs antivirus which is described in this article are described in random order. In time I used most of these software antivirus tools and I can say that I have helped in repairing the problems with viruses, trojans and spyware. The most important think that you can use a free online scanning tools is the money (you can use the antivirus tools without you buying) and because we have the privilege to choose which of these you will use. In this article I will describe five of free antivirus tools and I’m sure that on the Internet are more than five free antivirus tools. In time I will update this article with more antivirus tools which can use free online.

A. Panda ActiveScan 2.0

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ActiveScan 2.0 is an advanced online scanner based on Collective Intelligence (scanning in-the-cloud) that detects malware that traditional security solutions cannot detect.

  • Make sure your antivirus is offering you proper protection.
  • Find hidden threats on your PC, such as rootkits, banker Trojans and malware designed to steal your identity.
  • Simple, online disinfection of all malware detected on your PC.

B. Kaspersky online scanner

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The Kaspersky Online Virus Scanner scans your computer for malicious code and offers the same exceptional detection rates as other Kaspersky Lab products.
This free online virus scanner is very powerful and scans your machine very deeply, so it could take hours to complete. We suggest running it during a time of low activity. Take the Kaspersky Challenge and see what malware your current antivirus software missed – you may be surprised.

C. Trend Micro’s FREE online virus scanner

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Trend Micro HouseCall is an application for checking whether your computer has been infected by viruses, spyware, or other malware. HouseCall performs additional security checks to identify and fix vulnerabilities to prevent reinfection.

D. avast! Home Edition

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avast! antivirus Home Edition represents the best FREE antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial & home use only. Both of these conditions should be met!

E. PC Tools AntiVirus Free Edition 6

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With PC Tools AntiVirus Free Edition you are protected against the most nefarious cyber-threats attempting to gain access to your PC and personal information. Going online without protection against the latest fast-spreading virus and worms, such as Netsky, Mytob and MyDoom, can result in infections within minutes.

Once infected, the virus will usually attempt to spread itself to your friends, family and associates by accessing your email contacts and networked PCs. The infection may also allow hackers to access files on your PC, use it to launch attacks against other computers and websites or to send mass SPAM email.
That’s why PC Tools AntiVirus Free Edition provides world-leading protection, with rapid database updates, IntelliGuardTM real-time protection and comprehensive system scanning to ensure your system remains safe and virus free. PC Tools products are trusted and used by millions of people everyday to protect their home and business computers against online threats.