avast! Free Antivirus is perfect for people who send e-mails and surf popular websites.

Features:

• Improved Antivirus and anti-spyware engine
• New avast! Intelligent Scanner
• New Silent/Gaming Mode
• New Behavior Shield
• Real time anti-rootkit protection
• Smart virus updates
• avast! Community IQ
• Behavioral Honeypots
• Green computing
• avast! iTrack
• File System / Mail Shield
• Web Shield
• IM / P2P Shield
• Network Shield

Free Edition:

• Antivirus Kernel
  • Almost 100% detection
  • Outstanding performance
  • Reasonable memory requirements
  • ICSA certified
• User Interface
  • Memory test during the program startup
  • Very intuitive Simple User Interface
  • Testing whole disks or selected folders
  • Working with the scan results actions with infected files
  • Virus encyclopedia
  • Log Viewer
  • Various appearances skin support
  • Running from Explorer context menu
  • Antivirus screen-saver
• Updates
  • The system of incremental updates guarantees low traffic
  • The updates can be completely automatic
• Resident Protection
  • Standard Shield protects the file system
  • Generic SMTP/POP3/IMAP4 scanner
  • Specific MS Outlook plugin
  • Heuristic analysis in e-mail modules
• Repairing
  • Limited capability of direct repair (especially macroviruses)
  • Repairing files using automatically generated Virus Recovery Database (VRDB)

What's New:

• solved incompatibility with System Safety Monitor
• improved compatibility of the self defense module with XP SP3 (and its installation)
• minor enhancements in the Web Shield (detection of streaming content)
• minor fixes in the updater