Windows audio and video playback help

As the title says, when I play the video using MPC-BE, the DTS-HD audio track of the video cannot play the sound, and the same is true when playing it with Windows Media Player. Do I need to install other plug-ins?

Go to the Audio TAB of my Settings Application.
Uncheck the box [x] Enable LAV Audio OR set it tto use (speakers) above that box.

Test with MPC-BE.
If it works but doesnt get loud enough, set the checkbox for [x] 20% louder