Antivirus software are computer programs that attempt to identify, neutralize or eliminate malicious software. The term "antivirus" is used because the earliest examples were designed exclusively to combat computer viruses; however most modern antivirus software is now designed to combat a wide range of threats, including worms, phishing attacks, rootkits, trojan horses and other malware. Antivirus software typically uses two different approaches to accomplish this:
* examining (scanning) files to look for known viruses matching definitions in a virus dictionary, and
* identifying suspicious behavior from any computer program which might indicate infection.

The second approach is called heuristic analysis. Such analysis may include data captures, port monitoring and other methods.
Most commercial antivirus software uses both of these approaches, with an emphasis on the virus dictionary approach.

avast! antivirus Home Edition 4.8

Features List:
Anti-spyware built-in
Certified by West Coast Labs Checkmark certification process, avast! antivirus Home Edition 4.8 now comes with anti-spyware capability built in to the scan engine.
avast! antivirus 4.8 now offers even more protection for your valuable data and programs, all in one download.
Anti-rootkit built-in
Another key feature of avast! antivirus 4.8 is the inclusion of anti-rootkit technology, based upon the class-leading GMER technology, and now built-in to the scan engine as standard.
Rootkits are programs that install on your system, while keeping themselves, their processes, services and registry keys hidden, to stay invisible. They represent a substantial security risk on home and company networks and standalone machines, and are usually notoriously difficult to find and remove.
avast! antivirus 4.8 has full live-system anti-rootkit protection. No boot disks required, it's all built-in and working with one install.
Strong self-protection
A significant security feature has also been added to avast! itself. avast! antivirus 4.8 now includes strong self-protection, to prevent malware from turning avast! protection off.
This key enhacement helps to add that extra layer of protection to protecting your data and programs with the multi-award winning avast! antivirus technology.

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