Hi :
Should NOT have Avast AND Norton ( anything ) installed
on your computer at the same time; will cause big-time
"conflicts" . There are lots of good & FREE firewalls
available to take the place of the Norton one, including
the bought out, then abandoned by Symantec/Norton
called "Sygate Personal Firewall", best downloaded from
www.filehippo.com/download_sygate_personal_firewall/ .
The bigger problem is to COMPLETELY REMOVE Norton
by : 1) ""Uninstalling" ALL its components from
Add/Remove Programs; 2) Run the "Norton Removal Tool"
which is available at :
www.majorgeeks.com/Norton_Removal_Tool_SymNRT_d4749.html ; 3) Use your computer's "Search > All files and folders",
using the search "term" "Symantec" and later "Norton" and
"Delete" ALL it finds ; 4) If possible, use a SAFE & GOOD
registry cleaner to remove entries there .