You're welcome. There's no comparison at all between us, what we do and those entities. The people you talk with there are first or second year learning students of I.T.
Although we never stop learning, Trouble and I are veterans...seasoned professionals that you can not find a match to, by dealing with companies like that.
Update the firmware to your router, and visit the manufacturer of your ethernet adapter for the latest driver and install, then set the negotiation speed back to original. If the connections works and the x goes away, great. If not, simply set the 10 MB/full again.