Go into Control Panel, then Add/Remove Programs. Wait for the list of all programs to load up.
Go down through the list and look for Norton Internet Security. Remove it. It will take a very long time, sometimes 1/2 hour or more depending on speed of computer. Reboot the computer after it has been removed, especially if/when it asks you to reboot after the process.
After rebooting, go back into Control Panel, Add/Remove Programs. Look for Symantec or Norton's Live Update, remove that as well. Also remove any other Symantec/Norton Anti-Virus or Internet Security programs as well. Then reboot the computer again.
Your computer should be much, much faster now. So now you need a new Anti-Virus program...
I've found in my experience that Norton and McAfee do more damage to some computers than good, besides the fact that they are severely over-priced. I would NEVER install either Norton (Symantec) or McAfee on anyone's computer. Matter of fact, I just had to remove Norton 2008 from a lady's computer today, an old Dell 2400 because her system was too old and slow to run new Norton.
My suggestions for much better anti-virus would be...
- Kaspersky Anti-Virus (search for it on Google, etc)
- Trend Micro PC-Cillin Anti-Virus (search for it on Google, etc)
- AVG Free Anti-Virus at http://free.grisoft.com
, they also have more elaborate versions with more protection for a cost.
I personally use AVG on my computers, and my family does as well. It's very effective and gets out viruses that even Norton cannot remove.