To restart an app:
- Click the "Task View" button to see thumbnail views of each of your currently running apps and programs.
- To close an app shown in thumbnail view, click the "X" in its upper-right corner. With a mouse, you can also right-click the app’s thumbnail, and choose "Close" from the pop-up menu.
- To leave the Task View mode, click or tap the desktop.
- Start the app again.