Hi MarilynStern
you will need to activate the mcafee product, if you haven't already, then use the mcafee removal tool to remove it.
step 2 on this guide
https://service.mcafee.com/webcenter/portal/ora...
windows defender has come a long way in recent years and is now as good as anty purchased security solution (e.g Norton)
it is developed by microsoft specifically to work with windows and not against it
of course the choice is yours but personally i would not bother with either Norton or Mcafee.