Since Windows 8, the newer Microsoft OS's have been designed with touchscreen capabilities in mind. This led to the diminished functionality of the classically recognizable Start menu. Earlier versions of Windows 8 didn't use a start menu, that bottom-left based pop-up menu that Windows users...
There are 2 documented causes of the Metro tiles not working when clicked on:
1) If your screen resolution is below 1024 x 768 the Metro tiles will not work. Right Click desktop and choose Screen Resolution. Set it higher. This might be a problem with smaller screens.
2) If you shut UAC...