First off, what tells you it is actually using your wireless over the wired? do a Ctrl alt delete and go to task manager, then networking tab. then do some network activity like watch a youtube video or something and see what graph is being used.
Normal at least in my experience the wired connection all ways is the dominate connection. Unless the wireless was connected first then the wired was connected lator, that happens on my laptop, drives me crazy, I have to disable my WiFi for it to go back to wired.
But to answer your question I think the first option will work, the second option will defiantly work
1. Go to your network and Sharing Center, you can get to it by the wireless bars on your teskbar by the clock. After you have gone to Sharing center click on Change adapter settings. I am guessing your don't have the File Edit View... ect tool bar at the top of your window. So you will need to press Alt to show it. Then go to the Advanced menu then go to Advanced Setting, there you should find a list of your network cards in the Connections box
Move the network card you want in this case the wired one, mine is called Local Area Connection, move that to the top of the list with the up arrow button next to the box. And then click ok. and your done, you might need to restart for it to take affect
2.A for sure way to do it is to just disable the wireless card. That is in the same place where you fould the Advanced menu, it should have little network card icons right click your wireless one and click disable.