Did you turn your onboard audio off in your bios?I don't have a realteck sound card, its asus.
Norton is the most horrific piece of garbage I've ever had the displeasure of supporting. I sincerely hope someday people file a class action lawsuit against symantec for that filth. It's worse than actually getting a virus in many cases. Use it long enough and someday it will bite you too, mark my words.norton is a good AV, and I am going to get norton2009 next month.