Hopefully I catch you before you go, but I did a test.
So I moved the computer to the router room, and hard lined directly to the router. Low and behold (always wanted to say that) the server browsers work fine, for Steam and Brink. Good news right? Sorta. So I disconnect from the router by unplugging the Ethernet and switch back over to WiFi. I run the server browser.....still works, what? I tried Brink's in game browser, that also works. Did it manage to fix itself?? I got excited for a moment. Maybe the Ethernet just cleared some faulty settings, I have no idea. So I wanted to double check, I restart the computer with only WiFi. Run the server browser and BOOM, locked up. Now granted I think we can see the problem is specifically related to the adapter, perhaps I can still save myself the 30 dollars because of the new information that I picked up.
Any of this make sense to you? It sure doesn't to me!