Vlk instructions always work ;D
Maybe you didn´t have the 4.1.280 version at first time and the recent versions (4.1.268 and 4.1.278) were buggy about updates…
Everything is ok now… :wink:
When you update the program you get the virus definitions updated too… At this time, try to use more the program update because they´re very frequently and avast! is becoming better and better… :wink: