إقتباس :Avast! antivirus software provides complete virus protection for your computer. Antivirus engine is complemented by anti-spyware, firewall and antispam modules to protect you against phishing schemes, identity theft and internet-distributed web viruses. Automatic updates for greater user convenience and safety. Top user ratings among free antivirus software. The new avast! Free Antivirus 5.0 includes a spyware detection engine. To protect you from identity theft as well as viruses.
Avast! Pro Antivirus - better protection during web surfing. Full-featured antivirus software. Better than our free antivirus, especially for web surfing, but without the firewall and antispam included in avast! Internet Security. Also if you wish to customize your security, this is the recommended software.

• Continuous protection against viruses and spyware
• Ensures all mails sent and received are clean
• Keeps you protected from "chat" infections
• Stops attacks from hijacked websites
• Lets you safely browse suspicious websites or run unknown applications
• Allows safe and uninterrupted gaming
• Compatible with Windows XP, Vista and 7
• New user interface

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