Try adjusting each setting in Norton/symantec settings
I'm not suggesting to disable the resident part of it. never do that while on the Internet.
Another thing to try is Uninstall it while disconnected after already having downloaded a replacement, AVG, Antivi or avast are all free to home users.
Norton/symantec doesn't clean up after itself well, after uinstalling if you choose to:
http://basconotw.mvps.org/SymRem.htm
In internet explorers options > security use the default level button for each zone, while there add those problem address's to the trusted zone.
In internet options > advanced use the restore defaults button.
Internet explorer > help about what does it say for cipher strength ?
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Any progress ?