We will need your system details to help you further.
As for XP firewall; (a) Quote from Grandpa:"... it depends on which view they are using to view control panel there are 2 choices Classic and Category if they are using classic the way you told them to find the firewall settings is correct if they are using category then 6_pac's explanation is correct."
(b)
http://www.gnutellaforums.com/window...tml#post178620 Explains how to disable it, but at least an explanation about how to access it depending on which view you are using.
It's my guess your connection problem is your router/modem, so we need details about it.