You tried to just remove it fully?
Run the mcpr tool after a windows uninstall two times just to be sure.
Try to think of something more fun to do with your time I would have given up and posted here at 10 times.
When a Free Trial of anything, no matter what brand, expires you are expected to remove said software or pay up to continue using it. I would say that you have no-one to blame but yourself for the constant reminders.
However, if part or all of that software happens to be Family Protection or Anti-Theft, then specialist attention has to be given to remove it. If that's the case I suggest you be more specific and we can move this thread to the appropriate section for better support.