What did you replace Norton with?
I use Norton AV on my main computer and don't have any problems. I did however have to remove Norton Internet Security suite from my neighbors new laptop. It ran noticeably better without it. I put Kaspersky AV on and activated the WindowsXP firewall.
I run Kaspersky firewall on one of my computers, but I never really know how good of a job firewalls are really doing. I just use it for the program permissions.
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