I switched 5 years ago-- never regretted it once. I had a problem... contacted "Symantec Tech Support"--never even got an answer--I said
Norton Products can also be difficult to fully remove -- it gets into many "corners" of your OS.
This.... put out
by Norton can be of help:
Download and run the Norton Removal Tool
Be sure to reboot.
It would also be prudent to run a registry-cleaner like the free Easy Cleaner
Official ToniArts software pages
and reboot
again before installing anything else.
Differing AV/ Firewall programs can often end up fighting each other-- in stead of protecting you.