An application is frozen Sometimes an application may become stuck, or frozen. When this happens, you won't be able to close the window or click any buttons within the application. Solution 1: Force quit the application.On a Windows computer, press and hold Ctrl+Alt+Delete on your keyboard to open the Task Manager.You can then select the unresponsive application and click End task On a Mac OSX computer, press and hold Command+Option+Esc. You can then select the unresponsive application and clickForce Quit. Solution 2: Restart the computer.If you are unable to Quit an application, restarting your computer will close all open apps.