Norton is a resource hog no doubt. When I had Norton installed I experianced more pc issues than any virus ever caused. As a matter if fact only time I had any viruses was while Norton was in use

One thing Fozz is that you shouldn't be running 2 AV programs, chances are it isn't offering any extra protection, it is using far more resources than necessary, and third knowing Norton it is probably not allowing AVG to do anything most likely rendering AVG useless.
Personally I would banish Norton completely, which will probaly require a format anyway to remove all the crap that will be left behind even after a uninstall.
For a paid AV I highly recommned NOD32, it has a small footprint, very little resource use, and with it installed I have yet to have any type infection and I don't need or use a firewall (one more resource hog not running) or any spyware software .
For free AV stick with AVG or AVAST, both good, do the job and don't kill your pc.
As for the other system tools Norton Works provide Im certain there are comparible freeware programs that will do the same thing, maybe even better.
I know they say that Norton is the most widely used AV protection, but when you consider almost every prebuilt pc and most other software you buy forces it on people, it is no wonder, i am just curious how many use and buy Norton by actual choice?