I downloaded a game, to be more specific ラブネトリ by <ようかい玉の輿> And when the voices sound, it sounds a horrible static sound, like that one of a TV. I do not know how to fix this, and I doubt the game was made like this.
Try to update ur Video and Sound Drivers as well try to install most recent directX and VCredist, also some visual novels needs .NET Framework to work properly. If this doesnt work try to reinstall the game.
(if u use Applocale to install/play, instead of using it set ur sistem locale to Japanese in this way everythings should work perfectly)