Take a look at the majority of HiJack This logs posted in the security section and note how many show Norton being the antivirus program installed. You won't have to go through too many threads to see that.
Sorry PcEye but I will have to disagree with you here.
If you go over to any HiJackThis forum and look through the logs - the majority of the time it is AVG that is listed as their protection and what has let them down.
The honest truth is that Norton does actually have the better detection and protection rates over AVG or Avast, although having said that it still wouldn't be my recommendation when there are other programs available that have even better detection/protection rates and are a LOT cheaper.
AVG is what I would call an "adequate" security solution, which is ok for people with good practise in internet browsing. You or I may be able to spot an obvious phishing attempt or scam (like the famous "you are infected" messages), but the majority of standard users cannot, and this is where protection like AVG, etc let them down.
Pay-for programs (be them Norton, McAfee, NOD32, Kaspersky, F-Secure, Prevx1, etc) are a lot better at stopping these.