Free antivirus

What are anti � virus Software, and what do they do?

anti � virus Software are a tool that helps us in the detection and elimination of any type of harmful program that enters into our computer, and also their spread and transmission, even though, nowadays antivirus software are more focused on prevention or precaution than in disinfection itself, they were born during the 80�s decade , and only with the pass of time have improved themselves into more

complete  and sophisticated programs, because they are not limited to the detection of computing viruses, but they are also able of blocking infections by themselves, without taking into account whether the infection is from a web site or an external device, and they can also detect any type of harmful software, such as malware, spyware, etc.

The modus operand of each antivirus software is different, even when their regular behavior is based on having a list of the known viruses and the way of recognizing them, contrasting the list with the stored or transferred files from and into the computer. Their main functions are the vaccination: an installed programs that resides in the memory, it acts as a �filter� for all the programs that are been used, opened to be read or copied, in real time.

Detector: Is the program that examines all the existent files in the hard drive or the ones indicated in a certain route or PaTH. It has control instructions and precise recognition of the viral codes which allows it to capture its mates that are properly registered and then, their structure is dismantled extremely fast.
Eliminator: Is the program that acts once the virus� structure has been dismantled, that is when it proceeds to eliminate it, and immediately after, it repairs or rebuilds the files and affected areas.

Nowadays, there are many antivirus software that use different techniques to search for the viruses, the most employed one is the one that uses the heuristic mode, this term involves functionalities such as detection through generic firms, compiled code recognition, disassemble and the removal of packages, among others.

another technique employed by antivirus software, is to detect the HIPS mode, this method basically consists on prevention against external intrusions, meaning the blockage of entrances that want to sneak into our nets without an invitation.
 

among the most recommended anti � virus software, we find the following: Kaspersky, a really complete anti � virus software, it has active checking and prevention. It has tools for spyware detection and it cleans up the registers. It performs an extremely complete scanning, this is why it can be a little bit slow. To download the free trial you can go directly into their website (http://www.kaspersky.com/anti-virus_trial); another very good one is the active Virus Shield, this powerful anti � virus software turns out to be really complete, because it owns: active analysis of the files in real time, e � mail scanning, automatic updates, etc. To download it, just go to the following website: (http://www.activevirusshield.com/antivirus/freeav/index.adp?). another recommended antivirus software is NOD 32, which besides completely scanning your system, has damaged files recovery (http://www.nod32-es.com/home/home.htm).