Press Ctrl + Shift + Esc to open Task Manager
Select the frozen application
Click End task
Press Alt + F4 to close the active window
Press Ctrl + Alt + Delete and choose Task Manager
Right-click the application on the taskbar and select Close window
Open Command Prompt as administrator
Run taskkill /f /im appname.exe
Open PowerShell as administrator
Run Stop-Process -Name appname -Force
Restart the computer if the application still will not close