Tablet stuck on click

I got a tablet from a friend, whose pen died, so I ordered a new pen and she gave me the tablet for free, now a few months later, the pen is stuck on click. I hover over the tablet with it and it does what it would as if it was "Clicking" something. I have tried to take it apart, but it's not possible. I have twisted the pen eraser as well, unplugged the tablet and plugged it back in, rebooted my computer, I'm out of ideas for what to try.