Free antivir software for windows

Firefox add-on will display antivirs current virus definitions version in the status bar Antivir Current Virus Definitions Update This will displayes the Antivirs current virus definitions version in your status bar.
Main features:
- Auto-update (every 10 minutes)
- Last Update (on hover)
- Link to Definitions detailed info
- Link to Download updates manually
- Links to Info on Antivir website.
System requirements:
- Firefox: 1.5b1 ? 2.0.0.

Free, effective protection against computer viruses AntiVir Personal Edition is a software that helps you protect and monitor your PC.
Avira AntiVir PersonalEdition Classic is a comprehensive, easy to use antivirus program, designed to offer reliable virus protection to home-users only.
Avira PersonalEdition Classic constantly and rapidly scans your computer for malicious programs (such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc.), monitoring every action executed by the user or by the operating system and being able to react promptly when a malicious program is detected. Actions include repair, delete, block, rename and quarantine programs or files.
Avira PersonalEdition Classic also features enhanced protection against unknown boot-sector viruses, issuing alerts for boot sectors suspicious formats. Through the permanent update of the detection engine, the protection is ensured constantly: the user can set the product to download any updates when available, thus keeping you clean and safe.
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
- Install and configuration in just a couple of steps, setup to protect your PC in minutes
- 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
It also performs Internet updates, and daily opens a window, with an advertisement suggesting the user to purchase AntiVir PersonalEdition Premium
System requirements:
- Pentium I 133 MHz or better
- 30 MB of free HDD
- 20 MB of free RAM
Note: In order to involve in charitable projects and to benefit of more features like MailGuard, Adware and Spyware detection, Advanced set-up, etc you may acquire the appropriate Avira AntiVir PersonalEdition Premium license for just 20 Euro. Five euros of every online sale go to the Auerbach foundation that support various social, scientific, cultural or otherwise charitable projects. More info here