Avast! sisteminizde tam güvenlik sağlayan bir antivirüs yazılımıdır. Bilgisayarınızı hacker saldırılarından ve virüslerden korur. Gelen saldırıları engeller ve size bildirir. İsteğiniz doğrultusunda sisteminizi virüs taramasından geçirir. Programın kolay kullanılabilir arayüzü, e-posta koruması ve otomatik güncellemesi gibi özellikleri vardır. Virüs, solucan ve truva atları (trojan) ile savaşmak ve sisteminizin güvenliğini sağlamak istiyorsanız Avast! Professional Edition yazılımını kullanabilirsiniz.

  Avast! 4 Professional Edition is a collection of high-end technologies that work in perfect synergy, having one common goal: to give you the top grade protection against computer viruses. It represents an ideal solution for any Windows-based workstation. avast! 4 Professional Edition is a complete ICSA certified antivirus software for your company. It obtained VB100% awards in 2002/4 Virus Bulletin comparative reviews.

Avast! scans for viruses, worms and Trojans: On Demand - with two User Interfaces, On Access, E-mail, during Boot Time, in File Explorer and Screen Saver. It maintains Virus Chest. Protects E-mail, HTTP, NNTP, ICQ, mIRC, Kazaa etc. True incremental updates based on iAVS technology updates twice a week virus definition file.
avast! Home/Professional now fully supports the 64-bit Windows and Vista platforms.

Features:
- Antivirus kernel
- Simple User Interface
- Enhanced User Interface
- Resident protection
- Script Blocker ( Professional Edition only
- P2P and IM Shields
- Network Shield
- Web Shield
- Automatic updates
- PUSH updates
- Virus Chest
- System integration
- Command-line scanner
- Integrated Virus Cleaner
- Support for 64-bit Windows / Vista
- Internationalization