avast! 4 Home Edition is a free complete ICSA certified antivirus software for home noncommercial use.
avast! obtained VB100% awards in 2002/4 Virus Bulletin comparative reviews under Windows.
avast! Home Edition includes the following components:
On Demand Scanner - with Skinnable Simple Interface - just select what do you want to scan in which way and press the Play button.
On Access Scanner - resident scanning of all files being opened, read and written and behavior blocker monitoring dangerous actions of viruses.
E-mail scanner easily integrates with most mail clients and it checks both incoming and outgoing mails, it provides heuristic analysis of mail content to protect against new Worms.
Network Shield - scans traffic for malicious content - lightweight Firewall.
Resident protection for IM programs (e.g. MSN Messenger, ICQ) and P2P programs (e.g. Kazaa, DirectConnect).
Boot Time Scanner - scans disks in the same way and in the same time as Windows CHKDSK does (on NT/2000/XP only).
Explorer Scanner - right click on the object allows you to scan it.
Screen Saver Scanner - scans PC during your coffee breaks.
Virus Chest - safety isolated folder to store infected, suspicious and even some system files - to restore them.

True incremental updates of size under 100 KB are available at least twice a week and within couple of hours in the case of emergency of new virus. avast! automatically checks for new updates - downloads, installs and loads them without restart or logoff. Program upgrades are available time to time, they are incremental too (about 300 KB).
avast! 4 Home is available in English, French, German, Italian, Japaneese, Polish, Portuguese, Russian, Spanish and other languages - check http://www.avast.com/eng/down_home.html to download avast! in your language.
You will download a 60 days fully functional demo. You will obtain the FREE license key by E-mail after the registration at http://www.avast.com/i_kat_207.php?lang=ENG.