activating windows defender without uninstalling norton

Hi, I've had an issue with Norton Security Suite supplied by Comcast ever since upgrading to Windows 10. It's a perpetual popup of the Norton Download Manager whether Norton is installed or not. End up going back to Norton support and though their techs have taken control of the computer 5 times and assure me the problem is solved, it isn't. Have been given 4 different case numbers for the same problem. I'd like to get rid of Norton once and for all and use Windows Defender and Firewall, but seem to be caught in a catch 22?

https://support.norton.com/sp/en/us/...rProfile_en_us


Use the Norton Removal Tool. Also, check your registry and delete Norton/Symantec keys and open This PC to delete any folders. I would also recommend a System Restore to a point before you installed Norton.

Thanks for your detailed and diverse suggestions. I'll check them out and let you know how things work out.