avast! Free Antivirus is a free complete ICSA certified antivirus software from home noncommercial use. avast! obtained VB100% awards in 2002/4 virus bulletin comparative reviews under windows.
avast! Free Antivirus 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. Kazza ,DirectConnect ).
• Boot Time Scanner - scans disk in the same way and in the same time as Windows CHKDSK does ( on NT2002/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 -safely isolated folder to store infected , suspicious and even some system files - to restore them.

True incremental updates of size under 100KB are available at least twice a weak 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! Free Antivirus is available in English, French,German,Italian,Japaneese,Polish,Portuguese,Russian,Spanish, and other languages.