We installed Norton 360 2012 in three home computers. I had to uninstall from one because it kept crashing and requiring a reboot for protection.
The really interesting thing is that my son's laptop, with Norton 360, has been running very slowly lately. I was about to buy a new hard drive and re-install Windows 7, but as a last-ditch effort I ran Malwarebytes just in case it caught malware that Norton missed. Malwarebytes found and removed a bunch of stuff, including several Trojans. I'm really surprised that Norton 360 had not gotten these.