Working on an XP laptop that uses MSE now, but there are leftover bits of Norton that are a pain - suspect it was removed using add/remove rather than the Norton tool. The subscription has long since expired, and I don't know what version it was. Advice, please.
Norton can be a really deep rooted program, some remnants usually remain, even after an uninstall, as you've found.
I'm not sure if the version of Norton you can download now would be the same as the on you had before so it may not remove the files/entries you found so try the Norton uninstaller programs recommended.
Once you've run the Norton uninstaller try using ccleaner to remove registry keys - don't forget to run a backup of the registry first.
Then try Comodo System Cleaner (CSC) - this is a much more aggressive cleaner that removes a lot more but to be sure you have thatccleaner reg backup done before you run it - this way you can restore it if any problems occur - CSC does give you the option to reverse changes but only once after a reboot, after that you can't roll back! I haven't had a problems myself but you never know!