I tried to install Norton on a family members computer and it wouldn't allow me. It kept on saying that "an unauthorized user is trying to access it". This would happen when the desktop opens. I can move the error message and run a live update which is what they suggest, but that still doesn't work. After the error message it gives you no other option but to press ok. Then another error comes up pertaining to the registry. I forgot to write it down. I will post it this afternoon, then it say "Please uninstall and reinstall this program". Then the only thing you can do is press ok and the computer will reboot everytime. I have uninstalled and reinstalled it 3 times ran the update. I wonder if it has a virus?