Best Free Antivirus

1.AVG Anti-Virus Free Edition

Antivirus and antispyware protection for Windows available to download for free

NEW- LinkScanner Active Surf-Shield checks web pages for threats at the only time that matters – when you are about to click that link.
AVG Anti-Virus Free Edition

* Award-winning antivirus and antispyware
* Real-time safe internet surfing and searching
* Quality proven by 80 million of users
* Easy to download, install and use
* Protection against viruses and spyware
* Compatible with Windows 7, Windows Vista and Windows XP
The AVG Link : http://free.avg.com/download-avg-anti-virus-free-edition

2. Download FREE antivirus software - avast! Home Edition

Features overview

Anti-spyware built-in Web Shield
Anti-rootkit built-in Automatic updates
Strong self-protection Virus Chest
Antivirus kernel System integration
Simple User Interface Integrated Virus Cleaner
Resident protection Support for 64-bit Windows
P2P and IM Shields Internationalization
Network Shield

All-inclusive and comprehensive protection FREE avast! antivirus Home Edition includes ANTI-SPYWARE protection, certified by the West Coast Labs Checkmark process, and ANTI-ROOTKIT detection based on the best-in class GMER technology. No additional purchase is required.

Simple to use and automated Daily automatic updates ensure continuous data protection against all types of malware and spyware. Simply install and forget. We've made avast! as simple to use as possible.

Tried and Trusted With over 80 million users of avast!, you can rest assured that you are using one of the most tried and trusted products in Windows security. We support more Windows versions (from Windows 95 to Vista 64bit) than any other anti-malware product. No matter what system you have, avast! has it covered.

Multilingual avast! Home Edition is offered in over 30 language versions.


The Avast Link: http://www.avast.com/eng/avast_4_home.html

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Kaspersky Lab -- Trial Anitvirus

Kaspersky Lab provides downloadable removal tools, product upgrades, antivirus and antispam databases, extra secure databases and product documentation on our website. You can also try any of our antivirus software products free for 30 days.
Antivirus Software: Free 30-Day Trials

It is always a good idea to try before you buy. You can download free trial software versions of our antivirus software solutions and decide which product fits your requirements. Our trial versions are valid for 30 days.
Antivirus database updates

In this section you can manually download the latest antivirus databases for your antivirus software and find out about the different antivirus updates currently available. You can also read about the different methods of updating antivirus databases - both for individual PCs and for centralized updates across networks.
Free Virus Removal Tools

Kaspersky Lab reacts proactively to all new threats. Occasionally there are viruses that require special treatment. In such cases we provide malware removal tools for each specific virus.
Kaspersky Antivirus Software Product Downloads

All current product downloads are located in this section: product upgrades, patches and documentation.
Software Documentation

For your convenience, product documentation is also available in a separate section, listed according to product.
Extra database options

Some people prefer to be extra sure. Our standard antivirus databases protect you from all viruses. However, if you want additional protection from other threats such as riskware, pornware and other illegal programs, this section is for you.

http://www.kaspersky.com/downloads

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McAfee Total Protection

* Safe Search & Surf
* SiteAdvisor Plus
* Always Updating
* Stops Viruses
* Halts Hackers
* Blocks Spyware
* Improves PC Health
* Secures Your Identity
* Prevents Spam & Email Scams
* Protects Children Online
* Backs Up & Restores Files
* Network Monitoring

Avira AntiVir Personal - FREE

Avira AntiVir Personal - FREE Antivirus

Avira AntiVir Personal - FREE antivirusAvira AntiVir Personal - FREE Antivirus is a reliable free antivirus solution, that constantly and rapidly scans your computer for malicious programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts promptly when a malicious program is detected.

Avira AntiVir Personal is a comprehensive, easy to use antivirus program, designed to offer reliable free of charge virus protection to home-users, for personal use only, and is not for business or commercial use. Available for Windows or UNIX.

http://www.free-av.com/en/products/1/avira_antivir_personal__free_antivirus.html

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Panda Security

One of the Best running antivirus around the globe.

Check it out why???

Panda Security:

Panda Global Protection 2009 protects you from viruses, spyware, rootkits, hackers, online fraud, identity theft and all other Internet threats. Thanks to the new Collective Intelligence Technology, the solution is now much faster than previous versions. You will also have at your disposal Tech Support 24h-365d, 24h-SOS service and the daily updates that ensure you are protected against all new threats that appear around the world. Its ease-of-use, simplicity and offer a Maximum protection with minimum impact on your PC. Version 12.01 updates databases.

check this link : http://www.pandasecurity.com/homeusers/downloads/evaluation/?sitepanda=particulares