Why is Norton not detecting Blocking of my Computer?

Everyday going onto the Internet is for me a complete nightmare. It does not matter what browser I use or which broadband supplier. The biggest problem is the blocking of the keystrokes I make. I will click a submit button to upload or a play button and nothing will happen. I also keep finding that the Internet Connection has gone down. Why is Norton not picking up the blocking of the communication between sites? Also if I send a group of emails all using the same ISP or server they will be blocked - Norton is not picking that up either.