Ok let's start with your Nortons Internet Security...Have a look at this link and try to configure it the same way...
Port Forwarding for the Norton Internet Security 2007
Also try uninstalling your Java from the add/remove programs and then re-install the JRE 5.11 offline version....As it is a little outdated....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
Charter is also known to limit bandwidth for accounts with a high traffic volume...
Charter Communications -