Hi,
Ive done all the "Properties" stuff as you've suggested.
I had SAS installed which worked perfectly but i took it off just to eliminate that as a possible problem.
I used to be with AOL, they messed things up with my old Voyager modem so they sent me one of their routers and its been a mess ever since. Their tech muppets said there must be a problem with my PC ethernet port so i bought a USB ethernet adaptor(thats the 2nd port) but that didnt work.
I dont think there is anything wrong with either port.
Did everything you asked and still no joy.