I believe it will always say it's connected to wireless but go through wired... I could be wrong about that though. I don't have a computer to test at the moment
Control Panel > Network and Sharing Center > Change Adapter Settings (on left panel) > Press Alt on your keyboard to view the menu bar > Advanced > Advanced Settings> move your ethernet port to a higher priority in the list using the Up arrow > Click OK and close all windows.
I've had to do this at work before, so this should work.