It might be partially the Norton package?? - I've read that it can be a heavy drain on the system.
I haven't tried any Norton AV programs for that reason.
http://reviews.cnet.com/internet-sec...-32330411.html


I'm assuming your using Windows?? - and do you know your CPU speed and Ram/memory amounts?

here's our useful sticky thread post #2 has some really good tips and suggestions.
http://neurotalk.psychcentral.com/thread4535.html
and
http://neurotalk.psychcentral.com/thread26151.html

reviews-
http://internet-security-suite-revie...enreviews.com/

Do you know how to check what services are running?
usually CTRL/ALT/DEL will bring up the Windows Task Manager