Top AntiVirus

AVG
AVG Free is well-known ,available free of charge to home users for the life of the product . Rapid virus database updates are available for the lifetime of the product, thereby providing the high level of detection capability that millions of users around the world trust to protect their computers.

Highlights

*AVG Free is easy to use and never slow your system down .
*It needs low system resource requirements.
*Automatic update functionality
*The AVG Resident Shield, which provides real-time protection as files are opened and programs are run.
*Free Virus Database Updates for the lifetime of the product.
and AVG Virus Vault for safe handling of infected files.

Though the free version of this program will suffice for average folks, those who demand more control should certainly consider AVG Anti-Virus Professional.
Link: http://free.avg.com/ww.download-avg-anti-virus-free-edition

Avira AntiVir Personal - Free Antivirus 8.1.0.331
*****Protect your computer from viruses, trojans, spyware etc.

AntiVir works surprisingly well. Its scans are flexible, allowing the user to fully scan all hard drives, choose a preloaded scan--for rootkits, for example--or customize a scan. Combining the antimalware with the antivirus is a luxury in a free scanner. After testing on several machines no viruses turned up, although several malicious hidden files did rear their heads. The heuristic scan can be turned on or off completely or partially, with three different intensity levels.
The quarantine is extensively thorough, too. The spreadsheet layout displays all relevant information about the quarantined file, and gives you options to scan it again, restore, delete, and more. The scheduler is fully customizable. Definition files are available at Avira's Web site if needed, and the help features are excellent, as well, with a description box relaying mouse-over information on each feature. Version 8.0 has introduced a faster engine and a faster definition file update, both of which are instantly noticeable improvements and yet still a bit slow.
*Although we could shut off AntiVir and its Guard, there was no way to remove the icon from the system tray or stop the occasional ad placement by Avira.
Home-users only.
Avira offers: Extensive Malware Recognition of viruses, Trojans, backdoor programs, worms, etc. Automatic incremental updates of antivirus signatures, engine and entire software.
*Permanent virus protection, with Virus Guard real time monitoring.
*You can Install and configuration in just a couple of steps.
*Virus protection against known and unknown threats, using an advanced heuristic system.
*Scheduler where you can set the scanner to make automatic virus scans or updates on your system. **Forum and phone support, Knowledge Base with virus descriptions available on Web site.
**Rootkit Detection and Removal.
***Version 8 adds an enhanced interface, a modularized AV-search engine for improved scan performance, an integrated failsafe security system.
***SMTP support for AntiVir MailGuard and a new Fast Activation Tool (FACT).
http://www.avira.com/en/downloads/

Avast Home Edition 4.8.1229.80826

Avast Home Edition is a complete ICSA & Checkmark certified antivirus, Checkmark certified anti-spyware & anti-rootkit package.

Avast includes the following components: On demand scanner with skinnable simple interface, just select what do you want to scan in which way and press the Play button.
*On access scanner, special providers to protect the most of available e-mail clients.
*Instant messaging--ICQ, Miranda.
*Network traffic-intrusion detection, lightweight firewall.
* P2P protection for Kazaa, BitTorrent.
*Web shield -monitors and filters all HTTP traffic.
* NNTP scanner-scans all Usenet Newsgroup traffic and all operations with files on PC.
*Boot time scanner-scans disks in the same way and in the same time as Windows CHKDSK does.
Avast Home Edition guards your PC and the network with multiple shields that scan executables and files. You can select parameters for scanning, and even choose wildcards to exclude specific file types. You can adjust the sensitivity level for the program's detectors when it comes to scanning downloaded files, instant messages, e-mails, and a host of P2Ps. Its efficient interface opens up window after window to tweak its settings to your liking, for novice to advanced level protection.
*Though it took quite some time to run, we're impressed with this application's boot-time antivirus scan.
*Fortunately, if you're in a pinch you can bypass it. If malicious contents are detected, Avast comes to the rescue with handy virus cleanup tools.
*You can block certain URLs and file operations, such as writing to files or even renaming, deleting or formatting them.


Norton AntiVirus 2009 provides fast, responsive defense against all types of malicious software including
*viruses
*spyware
*worms and other software threats.
**It protects your system without slowing it down. Rapid pulse updates every 5 to 15 minutes help to ensure that you're protected from the latest threats.
The new Norton Insight relies on extensive online intelligence to target only those processes at risk, resulting in faster, shorter, fewer scans. And the new Norton Protection System employs a multilayered set of security technologies that work in concert to detect, identify, and block attacks. Version 2009 improves on product performance.
***Working quickly and quietly in the background, Norton AntiVirus requires little memory and system resources.

PC Tools AntiVirus Free Edition 5
PC Tools AntiVirus Free Edition protects you against the most nefarious cyber-threats attempting to gain access to your PC and personal details. Going online without protection against the latest fast-spreading viruses, worms and Trojans 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 e-mail 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 protection, with rapid database updates.
It includers:
*IntelliGuard real-time file.
*Internet & e-mail protection and
*comprehensive system scanning to ensure your system remains safe and virus free.

ThreatFire AntiVirus Free Edition 3.5
ThreatFire is unlike traditional antivirus products that rely on old fashioned "signature" technology and require updating every time a new threat occurs. ThreatFire's patent-pending ActiveDefense technology provides powerful protection against zero-day and emerging threats.
It constantly monitors for both known and unknown *viruses
*worms
*trojans
*rootkitsbuffer overflows, spyware, adware and other malware. It uses behavioral analysis to hunt down and paralyze threats that are too new or too clever to be recognized by traditional "signature-based" antivirus software.

Trend Micro AntiVirus plus AntiSpyware 16

Trend Micro AntiVirus plus AntiSpyware 2008 is an essential security you need to safeguard all your data and files. With automatic scans, updates, and outbreak alerts, you can rest easy knowing you have systematic, ongoing protection against the latest malicious viruses, worms, Trojan horse programs, and spyware.This product is powered by the PC-cillin Internet security engine, proven technology that protects your computer from unforeseen intrusions.
Key features include:
*prevent unauthorized changes.
*enhanced software history cleaner.
*improved Web browser cookie management.
*Customizable security warnings.
*Security activity report
*Fully compatible with Microsoft Windows Vista install trend, protection against viruses, protection against spyware, computer scans, real-time protection, quarantined file recovery rather than immediately deleting potential or uncleanable threats, Trend, automatic updates and outbreak alerts.
*This program also features a real-time detection feature called Venus Spy Trap that alerts you to threats as they try to connect, but we found it to be a bit of a memory hog--though perhaps that's the price you pay for full protection.
*The scan time for this tool is among the fastest in our tests, and malware threats are identified and removed with ease. We like the added features for cleaning your Web cache and cookies. The document shredder for files you want permanantly deleted is another nice touch.
Norton AntiVirus 2009 16.0

Norton AntiVirus 2009 provides fast, responsive defense against all types of malicious software including
*viruses
*spyware
*worms
*and other software threats.
It protects your system without slowing it down. Rapid pulse updates every 5 to 15 minutes help to ensure that you're protected from the latest threats.
Working quickly and quietly in the background, Norton AntiVirus requires little memory and system resources. The new Norton Insight relies on extensive online intelligence to target only those processes at risk, resulting in faster, shorter, fewer scans. And the new Norton Protection System employs a multilayered set of security technologies that work in concert to detect, identify, and block attacks.

http://free.avg.com/ww.download-avg-anti-virus-free-editionhttp://www.avira.com/en/downloads/http://www.avast.com/eng/avast_4_home.htmlwww.symantec.com/norton/antiviruswww.symantec.com/norton/antivirushttp://www.avira.com/en/downloads/http://www.avira.com/en/downloads/http://www.avast.com/eng/avast_4_home.html