A lot of things can cause that. You say MP plays fine without any assistance? R. 
click on the 'Volume' speaker in your icon tray (lower right corner). click on properties 
and see what your settings look like there. If you have something different than 
your basic built in to the motherboard sound (an add on sound card) you need to find 
its audio setup/mixer to check the settings there. also if you run the DirectX Diagnostic 
you can really test things out and find deeper problems there.

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