TCP/IP enabled in the properties?
About the only thing I can think of at the moment.
Also, maybe try and update the network card's drivers.
Could be shitty default drivers.
Well, I thought it might be drivers, but the port was working not too long ago, we needed to use the laptop to program sonos connect units. My father swears that he was hardwired to a router on it not too long ago, but I think he's going senile, so w/e.
Dunno about tcp/ip, don't recall it being changed ever though.