Currently, the flux of information transmitted through the internet is really high, this makes our computers to be more vulnerable before virus attacks, because there is always the chance for one of them to sneak in if we do not have an updated antivirus software; this is why online antivirus software can save us from several types of viral infections, because, for been online, it has de advantage of always been updated.
Using an online antivirus software, we can know for sure that we can eliminate any virus that might sneak in, especially if we are using an operative system such as Windows, known for been the most attacked one, we can also use it as a precaution, due to the fact that many of the antivirus software used today are not fully updated with the last virus definitions in the net and we can use it as a safety to verify if our computer is clean.
The only requirements we need to fulfill in order to be able to run these antivirus is to count with a Windows operative system in any of its versions, most of the online antivirus software are compatible with Internet Explorer 5.01 or superior, although there are also others that are able to run with explorers such as Mozilla Firefox.
When running the analysis it might ask for some sort of approval for installing a plug in, because the Microsoft activeX technology is very used, when scanning, the antivirus checks the start sectors, the memory and other system files, as well as the zipped or encrypted ones. The best part is that it is very simple to use, because it is designed to be used by newbies and professionals in a more technical way, with more options.
The first free online antivirus software that you can visit is AhnLab. This antivirus provides this service to help analyzing and repairing parts of your drive, as well as it is online. It does it very quick and without the help of any other antivirus software; even if you did not had one installed in your computer, the only thing you have to do is to run the analysis and you will see a box showing the drives you want the antivirus to check.
To visit its website, you have to follow this link: http://global.ahnlab.com/global/products/myv3.html.
Other great free online antivirus software is the Threat Scanner. This antivirus is specialized in seeking and eliminating threats such as Spyware, malware or Trojans, the only thing you have to do is having the ActiveX installed, it does it in a quick and efficient way, besides it counts with a simple interface, very much alike the previous one, you only have to select the units in which you want to perform the scan. To use it, you have to go to this website: http://cainternetsecurity.net/entscanner/.
Finally, there is the famous Panda antivirus Online. This antivirus software only requires a user account created in its website and they will provide you their viral, worm and Trojans disinfection service, as well as personalized analysis, because you will be able to choose between disinfection modes and having a record of the analysis you have made. To be able to obtain the benefits of this software, you have to visit this webpage: http://www.pandasecurity.com/activescan/index/.