What kind of sound system setup do you have (aka how many loudspeaker do you have) ? If it's 5.1 or 7.1, the multi output mode is really problematic as the old game can't really process the info because it was coded in a really old style... so setting it back to the 4.0 should fix most cases..
That's one, there's another one, but if effects only some sound cards and it slows the game down, so it's unlikely the issue.
Thank you very much
Yor are my God now