Avast! AntiVirus
Avast! supplies not only commercial antivirus software, but also free antivirus software for home and non-commercial use only. All Avast! products have a 60-day trial limit during which the product will be fully functional. Both the free and payversions need to be registered after this period of time if you want to keep using, and updating, the program.

Avast! Home, free edition: download
Latest virusdefinitions: download
License / key: 1yr license
System requirements: Windows 95
Features:
- Realtime protection: files will be scanned when you download, open, save/use them)
- P2P and IM-shield: Instant messaging clients, such as icq, aim, msn etc but also P2P-programs like kazaa, will be continuously monitored
- Network shield, basically a firewall, feature only available when using Windows NT, 2000, XP or 2003
- Web shield, a component which watches the http (surfing) traffic, since some sites contain malicious code
- Windows 64bit support

Avast! Professional: download
Latest virusdefinitions: download
Purchase: 1yr license
Mostly the same as the free edition with these differences
- Enhanced user interface, giving you more control over the program
- Script blocker, this module checks all scripts executed on your computer for mailicious code
- PUSH-updates. Instead of autchecking for updates every now and then, push-updating, 'pushes' the update toward your pc as soon as an update is released. This eliminates the need to check for updates and assures you have the latest virusdefinitions
Installing and configuring Avast! Antivirus PDF
Common Avast problems, solutions and errorcodes