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.

Changes in Version 4.7.1001, April 30, 2007:
- Professional Edition: fixed installation of the ScriptBlocker module which could have previously caused various problems (e.g. in Internet Explorer)
- program installation now completes successfully even if Spyware Doctor is installed (the "OnGuard" module of Spyware Doctor contains a bug that was previously preventing the avast installation from working correctly)
- program installation now better handles the situation when repairing previous (corrupted) installs
- mail scanner: fix for marking of new emails as "read" (the problem was taking place in Thunderbird 2.0 in conjunction with some IMAP servers)
- fix for scanning of areas with East Asian names (Windows NT/2000/XP/Vista)
- added Armadillo unpacker