Thanks for your responses. It would be nice to be able to disable it completely! Here is what I have found so far in testing
- If you are at the login prompt when it is installed, the next user that logs in does not get the "Welcome to Avast" audio
- Once installed, logging in with other users does not cause the audio to be played, its only during the initial install
- If you install Avast while a user is logged in, you do get the "Welcome to Avast Audio"
This was all tested with Windows 7, I would expect the same with Windows XP.