Thanks for the response Mark.  That sounds like a lot of work reinstalling all of that software.  It seems like there should be a relatively simple solution for this cockpit sound problem, but it sounds like there have been similar problems with the C-130 sound for years now.  It's a shame because otherwise it's a great aircraft and a very good sim.  A dead silent cockpit really detracts from the realism and enjoyment of flying the C-130.  I'm keeping the faith that Captain Sim will give us a quick fix for this problem.