From the developer: "Avast Home Edition is an ICSA certified antivirus package for home noncommercial use. It includes On Demand, On Access, Explorer and Screen Saver scanners. E-mail scanner checks both In and Out-going 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."