I had the same problem when I first bought my laptop, the volume just would not go loud enough, and everyone that has Windows 8.1 with bing knows that the enhancement tab under speaker setting has been removed for some reason.

So, I have a very simple solution for you.

Download and install the newest RealPlayer (Now called RealTimes as of June 1st, 2015).

Get it here: http://www.real.com/

It now has a new feature that boosts the volume up too 200% instead of just being at 100%. You will see it at the bottom right of the realplayer screen.

I listen to all my music on it now. Update: Real now has named the program RealTimes instead of RealPlayer, do not worry, it still has the 200% volume option..

Please use it wisely, don't blow your computers speakers with it. ;)