This will show you how to use a new feature in Windows 8
and Windows 8.1
to refresh your PC
to keep all personal data, Metro style apps, and important settings from the PC, and reinstall Windows.
If a recovery image provided by your PC's manufacturer is present, Windows 8 will use that image when you refresh your PC. Otherwise, Windows 8 will use your installation media when you refresh your PC.
feature is something close to like what doing a repair install
in Windows 7 and Vista was for, but made a lot easier, faster, and safer to do now in Windows 8.