I am on windows 98se, my winamp does not play avi movies coded with divx or xvid or ac3 files had hard time with it, I use my windows media player, some movies the brightness is low I use windows media to brighten it up and notice the sound would go ahead of video.
To fix I left everything by default even the surroundsound opitions media has left that off when thats on too dont' matter which one you rap,talk,dance for bass the sound would also go ahead of video, I used my graphics driver to adjust the brightness all vids would play perfect, for your sound just gotta deal with it even if you have good speakers just turn it up loud if u love the bass, gunshots,etc.
etower 533mhz
524mb ram