Conflicting Antivirus Programs?

I'm not tech savvy so please excuse me if this is a silly question.

I installed Norton Security Deluxe on my laptop and desktop when the former security (another brand) expired.  No problems.

I've recently purchased a new laptop which came preloaded with the dreadful W10 (I'm still sobbing) and I wish to install the remaining Norton license on it.

Do I have to remove the existing Window 10 Defender antivirus software that came with the computer or do I have to delete that first, which I don't know how to do anyway.

It would be wonderful if I could install Norton without having to do anything technical beforehand.

Thank you for any help/advice you can offer.