system
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The problem is not in sounds… click here: http://forum.avast.com/index.php?board=2;action=display;threadid=3146;start=msg22552#msg22552
and search for my first reply in that thread (or even better it’s good to read whole thread, so you’ll find out little bit more about how everything works). You’ll find explanation and solution for your problem. All sounds are always replaced by default ones after program update, but you can awoid that if you listen my advice and do like I wrote in that reply… I already helped to someone…
Cheers !