I have Norton Internet Security 2003 and Norton Personal Firwall installed and recently I am no longer able to add items to my shopping cart on Amazon.com. Every time i try, I get a System Error from Amazon. I find that if I completely disable NIS then I can add items to the cart. I have been through almost evey setting in NIS and changing them has not made a difference. Amazon's support had few suggestions to resolve this issue and none of them worked. Has anyone had any similar issues and/or know of a resolution?