Install an App From the Metro UI
Select the Windows Store app or tile and click or tap it. Find the app you like, e.g. USA Today, by browsing the apps in the store or searching an app from the Charms Bar.
Select the app, buy it if it is not free, and install it. (Note: After users purchase an app, they receive a license that enables them to install the app.) If you logged in with a local account, you will be asked to sign in with your Windows Live ID. Installing an app usually takes a few seconds and, once it is done, you will be notified with short musical sound (like a ring tone). And the screen shows that app was installed.
Uninstall an App from the Metro UI
To uninstall an app, locate it from the Metro UI. Right click the mouse button or touch and swipe your finger gently. The app bar appears, and you can uninstall it from Start or uninstall it. The latter removes the app completely from your device.
If you uninstall an app from Start, the app is still available from your device; it is just not shown on the start screen or the Metro UI. You can find it from the Charms Bar and Pin to Start to add it back to the start screen, or to uninstall it.
Where are Metro Style Apps Located
Apps are installed under the %ProgramFiles%\WindowsApps directory. It is a hidden folder and managed by Windows. For more detail, check here.
Users acquire a Metro style app from the Windows Store as an app package. A package can contain one or more Metro style apps. Each package consists of the files that constitute the software, along with a package manifest file that describes the software to Windows. Windows installs and registers the app for the user who purchased it. There's no need for elevation to install the app, and there are no custom actions during the install. All required information is contained in the package. The user won't be prompted for additional information.
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