Avast Home Edition is an ICSA certified antivirus package for home noncommercial use. It includes On Demand (Simple and Enhanced user interfaces), On Access, Explorer and Screen Saver scanners. E-mail scanner checks both Incoming and Outgoing mails.
The true incremental updates of size under 100 KB are available at least once a week and in hours in the case of emergency of new virus. You can download and install them by one click and/or by scheduled update.