Avast Antivirus 2009 Pro scans 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.

Avast! antivirus kernel features outstanding detection abilities with high performance 100% detection of In-the-Wild viruses (the ones what are really spreading amongst people) and very good detection of Trojan horses, all that with only a minimum number of false alarms. The kernel was certified by ICSA; it frequently takes part in the tests of Virus Bulletin magazine, often yielding the VB100 award.

Its simple User Interface which is the main application of avast! 4 Home Edition, can be used to start on-demand scanning, working with the results, changimg various options etc. It has basic resident protection settings that can be modified here. There are additional avast! modules available such as the Virus Chest, Updater or Log Viewer.

The scanning is performed by so called "tasks". First, you define a task, including various parameters - areas to scan, what to scan, how to scan, etc. Having the task, you can (possibly repeatedly) run it. Each task generates a list of results; you can work with them later.

Resident protection, i.e. the real-time protection of the computer, is one of the most important parts of an antivirus program today. avast! features a powerful resident module that is able to detect the virus before it has any chance to infect your computer.

E-mail protection consists of two independent modules; first, there is a generic scanner working on the SMTP/POP3/IMAP4 protocol level. It is capable of protecting any existing e-mail client that uses these protocols. Second, there is a special plugin for MS Outlook only; it is completely transparent, requiring no special settings.

New feature of version 4 is heuristic analysis of e-mail scanners. It is extremely useful in protecting against new, unknown viruses and worms that are not possible to detect by the usual means. The heuristic module performs a thorough investigation of every e-mail message and watches for suspicious signs that might announce virus presence. When the number of those signs exceeds the user-defined level, the message is considered dangerous and the user is warned.

The resident protection of the Professional Edition includes an additional module, not contained in the Home Edition - Script Blocker. This module watches all the scripts being executed in the operating system (so called WSH scripts - Windows Scripting Host). It also scans all the scripts run as a part of a web page within your web browser (Internet Explorer, Netscape Navigator and Mozilla).

Automatic updates are another key point in virus protection. Both the virus database and the program itself can be updated automatically.

A special feature of the Professional Edition are PUSH updates. It is a dramatic change in the philosophy of updates. Usually, every installed program checks every now and then whether a new version is available. PUSH updates, however, are initialized by our server; they result in your computer quickly responding and performing the necessary update. The system is based on the SMTP protocol, i.e. on usual e-mail messages. The updates itself are controlled by the avast! resident e-mail providers (MS Outlook and Internet Mail).

The main properties of the Virus Chest are complete isolation from the rest of the operating system (no outside process, i.e. no virus either, may access the files inside) and the fact that the files inside the Chest may not be run (i.e. there is no danger in storing viruses there).

avast! antivirus features outstanding integration into your system. The scanning can be started directly from Windows Explorer, by clicking a folder or a file with your right mouse button and selecting the corresponding choice from the menu.

Another interesting feature is a special screen-saver that performs scanning for viruses during its run-time. avast! antivirus works together with your favorite screen-saver, so you don't have to change to anything you wouldn't like.

Another new option is the boot-time scan (Windows NT/2000/XP/.NET only). It is important in the case that a virus is suspected to be active on your computer. The boot-time scan is performed before the virus may get activated, so the virus cannot influence the scanning in any way.

Experienced users may like another Professional Edition feature - command-line scanner. The scanning can be controlled by many arguments and switches; to use as a pipe filter, a special STDIN/STDOUT mode is available.

The module is intended to be used in BATCH programs. Its output is the same as the output from the Enhanced User Interface tasks (including the report files).