i think i has the same problem
i have found one thing that works i have not figured out the mic as of yet
seems to want to just reenable its self from a mute
but your sound problems sounds the same as mine when i started try this
click on the sound icon
click on mixxer
find system sounds on the mixxer
then click on the icon above the slider
you should end up on a multi tab window goto the last tab communications tab
set it to do nothing
that should fix the random volume changes
i made a quick
tutorial http://www.sevenforums.com/tutorials...-leveling.html