I have switched ports with my wife's and got the same thing
downloaded the malware remover and it did find a few things but it had no effect on the speed.
next i will hook up directly to the modem to see what that does . if that doesn't work I will call my ISP for tech support. If that doesn't work i might go wireless since my daughters computer is older than mine and she is getting better speeds wirelessly them I am with a wire.