avast! Free Antivirus represents the best free antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial & home use. Its features include:
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

Avira 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.
Detects and removes more than 150,000 viruses
Always among the winners of comparison test featured in computer journals
The resident Virus Guard serves to monitor file movements automatically, e.g. downloading of data from the internet
Scanning and repair of macro viruses
Protection against previously unknown macro viruses
Protection against trojans, worms, backdoors, jokes and other harmful programs
AntiVir protection against viruses, worms and Trojans
AntiDialer protection against expensive dialers
AntiRootkit protection against hidden rootkits
AntiPhishing protection against phishing
AntiSpyware protection against spyware and adware
NetbookSupport for laptops with low resolution
QuickRemoval eliminates viruses at the push of a button
Easy operation
Internet-Update Wizard for easy updating
Protection against previously unknown boot record viruses and master boot record viruses