Antivirus and antispyware
Real time Anti Root-kit protection
File System / Mail Shield - Integrated Email Virus Scanner
Web Shield
IM / P2P Shield
Script Shield
Behavior Shield - Monitors activity on your computer using a number of sensors (file system, registry and network based) and reports/blocks any suspicious behavior.
Network Shield
Complete 32 bit and 64 bit support
Compatible with Windows XP , Vista and Seven
Avast Sandbox - lets you safely browse suspicious websites or applications)
Silent Firewall - blocks hacker attacks to protect your identity
Antispam - keeps your mailbox free from spam and scam messages
Command-line scanner
Multi-threaded scanning optimization: Avast! runs faster on new multi-core CPUs. A new avast! feature allows the splitting of large individual files between cores, accelerating the scanning process.