Audio Problem in WIndows 10, but not other platforms

I have a scene with some 20 audio sources, On my windows 8.1 machine all of the audio sources play properly,

then when i move the project, to the windows 10 machine (in a different country from me)

about half of the audio sources are playing at 10-20% of the volume needed, and changing the fadeout/dropoff, volume, etc, is making no significant difference.

I need a solution fairly quickly, as the project is being user tested at SXSW tomorrow. It seems to work on all machines, except the demo machine (windows 10)

thank y'all so much ~William