From a thread in the tech forum
Here's the trick to uninstalling & reusing Norton.
Been usuing & reusing Norton 2002 since 2002......
True Norton is a bit of a resource hog, uses about 5% system resources for me, but I'm familiar with Norton and that doesn't bother me.
Back in 2002 the guys at AudioGalaxy told me about it and have been using it since then. You don't need any special removal tool.
1: First uninstall Norton using the add/remove feature in your Windows control panel.
This will take out most but not all of Norton.
Symantec leaves behind several folders and a few registry keys, so you can't just simply remove & reinstall Norton.
2: Then click on, Start>Find>Files or Folders.
In 'Files or Folders' do a complete search of your computer for all Norton, Symantec & Antivirus, and delete all folders you find. There will be several.
3: Get and run a Registry Cleaner, which is freely available on CNET or Download.com.
After running Registry Cleaner, scroll through the registry keys listed and remove all Norton & Symantec registry keys you find.
Once you have done these 3 things, just reinstall Norton for another entire year complete with auto updates and all their features.
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That being said a couple months ago I switched to Avast, it's free, like it and it seems to be doing the job.