Have been a devoted Avast! user for two years and this is the first time this has happened. Background: WinXP, broadband connection.
Noticed the little red warning message that the Avast! update did not work. Right clicked on the spinning Avast! globe and chose UPDATING > !AVS UPDATE ... nothing happens.
Rebooted machine. After completion of reboot, Windows Security Alert box opens advising me my antivirus definitions may not be current. I opened the Avast! Simple User Interface and tried executing the update from there ... no response.
Since this is the first evolution of this situation, I'm a bit stumped. I have a valid registration and all other functions of Avast! (email guarding, etc.) seem to be working just fine. Any help would be appreciated.