Well , I have 3 different pop-up killers and I have them all turned off as you cannot view most sites without viewing pop-ups so the sound that I’m referring to should’nt be any of my pop-up killers .
However , I did what Eddy said and looked where he said and the sound file sounds identical to :
C:\Program Files\Alwil Software\Avast4\English\ready

But I don’t get what the ready sound would be getting ready for when It’s already running ?