I LOATHE Norton with an unending passion. It was my first anti-virus program and it was AWFUL! It failed to stop my computer getting infected. More than that, it was worse than the virus. When I tried to install a new anti-virus, it proved impossible to get rid of Norton. The uninstall option only removed certain parts of the software, leaving loads of Norton components around my PC stopping my new anti-virus from working properly. Even registry cleaning software couldn't remove it all. In the end I had to wipe clean my computer and reinstall every piece of software again.
At the present moment I use Microsoft Security Essentials and it hasn't let me down so far. Before that, I used AVG for several years.