AirPort works to stream iTunes wirelessly to speakers but then lose internet via ethernet.

I can set up my Airport Express 802.11n as a client for my speakers so I can play music from my windows 8 computer via itunes. But then I lose my internet on my ethernet on the same computer.

I follow the directions on the apple site, basically connect the airport to my speakers via audio cable, plug in airport. Select the wireless network connection from my windows 8 computer and connect. Works perfectly. Playing music from itunes to the speakers.

But now I can not get internet via my windows 8 computer. If I delete the airport wireless connection, I get my internet back.

I have searched the web and forums for answers but no luck. Help is much appreciated. Thanks