But, when the time comes to re-up...forego it and use AVG. You won't regret it.
In the meantime, you can certainly disable Norton by using MSconfig...just be sure you've disabled all of the startup programs that Norton runs.
Then download and install AVG Free and update it and try it for a while. If you do, use MSconfig to disable the AVGCC process which is in fact the Control Center which does not need to be running all the time and using up resources. If you want the Control Center to run, start it up via the Start menu. Disabling it with MSconfig will not affect the agent that runs in the background protecting your PC nor will it affect the update service should you decide to schedule regular daily update checks.
Any other Qs? Feel free to ask.
I have a Presario 6400 with XP so it's not too old. I will use the AVG on some junkers I tinker around with though. The only reason I haven't had them on line is no virus protection. I'll put it in one of the old ones so I can get used to it.