Answer:
Try to power off your computer then turning it back on
If it won't let you press shut off on your screen press the windows key on your keyboard and the letter L at the same time
and if that does not work try doing ctrl+shift+Esc and it will bring up task manager, task manager keeps track of everything that is running on your computer. Carefully find what is causing the problem and right click it and choose end task. It will terminate it immediately. But be very careful because if you terminate something important it can cause issues(but usually a restart will fix it)
Hopefully this solves your issue:)