honestly Norton is simply robbing you out of good money.
you spend good money on ram and processor and Norton is stealing it from you left and right? why, because they can't put out something better that is lighter, faster and much better.
uninstall Norton and get yourself Nod32
, its a full 30 trial, use if for 15 if you like it buy it, but its only gonna take you 1 day to love it
Norton has got 7 or more processes vs Nod32's 2, Norton is much slower then nod32.
in short they are not even in the same class, nod32 dwarfs Norton in every way.