Thanks for using ours products.
At installation Moonlight XMuxer on your computer the audio decoder filter is installed also.
You say that after uninstallation of Moonlight XMuxer you have lost audio decoder filter. Most likely your system does not have another suitable audio decoder installed, therefore you can not playback audio.
At present we have a release version of Elecard XMuxer Pro 1.0, you are welcome to try it.http://www.elecard.com/products/xmux_pro.shtml