I had been running with my onboard Realtek HD audio and having some sound issues with the C-130 as well as other vendor's aircraft.  The C-130 loaded fine but just had some sound issues.

In search of a solution for one of the other a/c over the weekend, I remembered I had a left over Creative Audigy 2 ZS from my previous computer so I thought I'd try it.  I'm running XP Pro and it found the drivers for the card during the new hardware discovery routine BUT then the C-130 crashed with a BSOD when I tried to load it.  This wasn't happening with any other a/c.  Argh... but there's good news.

I searched the Creative site and found newer drivers then the ones Windows loaded; I'm now running 6.0.1.1361 date June 27, 2008.  Those fixed the C-130's problem and it runs fine now.   Don't know if it'll help but thought I'd pass the info along.