A couple of things...Try updating your Java...
Uninstall all versions of 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
Your McAfee security center can be port forwarded...These instructions will explain how..
Port Forwarding for the McAfee Security Center
Try that and see how you get on...
