Disabling the firewall in McAfee won't help, have a look at this thread as well, there are tips from one of the developers of McAfee you can try...
http://www.gnutellaforums.com/genera...onnection.html
You could also try rolling back your version of Java... uninstall your Java from the add/remove programs and then re-install the JRE 5.11 offline version....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11