"I do not want to renew Norton at this stage I do not want to chance a complete uninstall but just turn off the reminder"
I'm a bit confused about what you do and do not want.
You do not want to renew Norton - so, I assume your AV definitions are out of date - hence the pop-ups.
You do not want to un-install Norton. But if you intend to install another AV program alongside Norton, they will conflict with each other.
I uninstalled Norton AV about 6 months ago using Add/Remove programs. It was a perfectly clean and painless exercise.
I then installed free Avast AV with which I'm perfectly happy.
I think that you need to make your mind up one way or t'other.