Norton is a resource hog. Alway seemed to be one. When I got rid of Norton, I noticed a faster computer.

You can also try checking for parasites. You know, spyware. Spyware is one of the biggest problems of slowing down a computer. More on that and removal tools can be found here

Hope this helps.


***The URL above does exist. Sometimes you get page not found. It's a forum bug. Refresh the page or try the URL again. It took me three tries to have it come up.