avast

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