I’m kind of playing catchup with posts. This is a post I wanted to make a few months back. I was going nuts because I have a 1gbps nic and a wifi N card running. Some downloads would slow down and I knew it was because the wifi nic was taking priority over the 1gbps nic. Since it has been awhile since I did it on my last machine, I found a post by techrena.net. See that post here: http://techrena.net/view-change-network-adapter-card-priority-binding-order-windows-7/
Its a repost but I thought I would help anyone else looking for it, thats the link to the info.