To uninstall a Windows Store app from Windows 8.1, first tap or press the Windows key to open the Start screen, press and hold or right-click the app's tile, and then tap or click Uninstall after the App bar rises from the screen's bottom edge. If you wish to remove an app from the Start screen without completely uninstalling it from your device, tap or click Unpin from Start, instead of Uninstall.
To uninstall a desktop app from a computer running Windows 8.1, point to the upper-right corner of the screen, move the mouse pointer down, and click Search. If your device features a touch screen, swipe in from the right edge of the screen and tap Search. Type "control panel" in the search field that appears, and then tap or click Control Panel from the search results that appear.
When the Control Panel window opens, go to View By, select Large Icons, and tap Programs and Features. Locate the app you want to remove from the list that appears, tap or click on it, and then tap or click the Uninstall option. Follow the instructions that appear to uninstall the app from your device.
In addition to uninstalling a program, you can change or repair a program from the Programs and Features section of the Control Panel.