To close, or terminate, a program in Windows 7, you should press the Ctrl+Alt+Delete keyboard combination on your keyboard to open the Windows 7 security screen. At the security screen, click on the Task Manager button. This will launch the Windows 7 Task Manager. You now select the process, or program you wish to terminate by left-clicking on it once so it becomes highlighted. Once you select a process, the End Process button will become available. To terminate the program, click on the End Process button and the program will be terminated.