Avast! Antivirus Pro Edition 4.8.1169 is a Antivirus Software product from avast.com, get 5 Stars SoftSea Rating, avast! Professional Edition is a complete antivirus package for small office home office use. It includes an on-demand scanner to scan files or directories as needed as well as an on-access scanner for automatic scanning of all files being opened, read and written. In addition, a behavior blocker monitors for dangerous actions.