Hi,
I have seen this here on a few occasions tho not with Win7... I think it has to do with a basic "brain fart" by windows trying to decide which connection to use.
As you didn't mention this test I will... Disable the wireless, then and use only the wired.... see if it connects...
Also, in IE, you may need to go into Connections (in my IE at least) and create a new connection when only the wired is being used.... close IE and then re-open IE....see if it connects....
May have firewall issues/settings that are blocking the wired connection in some way....
See if anything helps... write back...
SD1