Where are apps from the Windows Store installed to?
Solution 1:
It depends on your Windows 8 version:
Consumer preview, release preview, and final version:
C:\Program Files\WindowsApps
Developer preview:
C:\Program Files\Applications
However, it is a hidden folder, and if you try to access it, it will be prompted to you a "Access denied" box. I never tested, but this guide says you can unblock it.