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Yes, theducks is absolutely correct. Never run two anti-virus programs as they interfere with each other. Also, as stated, you must remove Norton using the special removal tool on Symantec's site. Using Add/Remove Program, or an Uninstall option in the Start Menu, will not actually remove all of the bits and pieces of the program. Symantec designed things this way.
I would suggest going to AVG's site and seeing what they require for you to uninstall AVG. Download any needed software, print any instructions (you will be offline so a printout is necessary). Download the latest free version of AVG - do not install it. Just download the installation program.
Go to Symantec's site and do the same thing.
Disable your internet connection (disconnect the internet wire into your computer, remove the USB wireless thing, or disable it via Windows - but only if you know the security password to reconnect) and then reboot your computer.
Remove AVG as instructed. Reboot. Remove Symantec as instructed. (You need to remove AVG first because otherwise it might interfere with Symantec's removal tool.)
After removing both anti-virus programs, reboot. You're trying to make sure that everything is cleaned out. Rebooting forces Windows to do some housecleaning.
Now install AVG. Reboot. Re-connect to the internet. (If you disabled the internet connection via Windows, you will need to re-enter the security password to access the internet.) Update AVG and it's virus defs.
Run a full system virus check. (While extremely unlikely, it is possible while running two AV programs to become infected as each program interferes with the other's attempt to handle the infected file.)
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