Windows 8 ships with built-in apps available on the Modern UI screen (formerly the Metro or Start screen), such as Mail, Calendar, Photos, Music, Maps, and Weather. Installing additional Modern UI apps is easy using the Windows Store, and uninstalling apps is just as easy. What if you accidentally uninstall a built-in app? It can be easily restored with a few clicks of your mouse. To begin, access the Modern UI screen by moving your mouse to the extreme, lower, left corner of the screen and click the Start screen button that displays. NOTE: You can also press the Windows key to access the Modern UI screen. How Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer