Press Alt + F4 to close the active app
Press Ctrl + Shift + Esc to open Task Manager
Select the unresponsive app
Click End task
Press Ctrl + Alt + Delete
Select Task Manager
Select the app
Click End task
Open Command Prompt as administrator
Run tasklist to find the app name
Run taskkill /IM appname.exe /F to force quit it
Press Windows + R
Type taskmgr and press Enter
Use the Details tab in Task Manager
Right-click the process
Click End task tree
Restart Windows if the app still will not close