Please do not double post. We will try to help you as quickly as possible, and double posting does not help and only gets you into trouble.
Regardless of the fact that you say you do not have Norton anti virus installed, it quite blatantly states that Norton is blocking the connection.
So you can say what you want that you don't have Norton, but I would look through your system files again, and make sure it's not still lurking in there.
Norton is famous for claiming everything that it doesnt immediately recognise to be a virus and thus blocking it or hiding it from view. I recommend using Microsoft Security Essentials instead.