Hi, I do not know the answer !!
I am having a simular problem, IE7 will not connect to the net, I use AOL9, but some sites such as Google maps and Earth, use IE7 ,
I would be interest if any one comes up with a solution to yours (and may be my) problem.
It is not a Firewall related thing (IE7is a permitted site), I am now scatching my hair out, (not much left though, hair that is)