Volume Dynamics and Equalization

Automatic Adjustment

Equalizing the Sound Level

Right click the speaker icon and choose Open Sound Settings from the menu which appears.

Next click on Sound Control Panel – over toward the upper right :

Click Playback, Speakers, Properties.

Click Enhancements, Loudness Equalization, OK.

That is all. Now your playbacks should all have the same loudness!

Edit: Set the default to Realtek Digital Output, then run the troubleshooter and allow it to fix/re-install the driver.