Alrighty, I can't load a demo. I get a can't bind socket (10022) error.
Also can't load a map, same error.
Vista Home Preminum with SP1 update, using Avast AV, ran your first test but not the 2nd test script. The game has been very laggy for quite some time, even worse with Norton. If I quit and connect again it seems to help.
Hope it helps... need more info let me know.