I've noticed Windows after XP had a strange bug where sometimes
you'd have disabled sound devices.* The bug went unchecked
through a few Windows versions - might be in the current one as
well. Go to wherever they're hiding the Sound Devices, right
click and see if you can do a "Show all Disabled Devices" and
see if something pops up that looks usable.* Solved a similar
problem on my Toshiba Laptop running Win7, and it helped out a
Desktop running Vista a while back... and a desktop running
Win8... might have carried through to 10 as well.