System Operations (Windows 8)
Recovery from the Operating System
Refresh PC
The Refresh PC utility checks whether the system files, Windows registry, and other important system components are working fine or not; on finding issues with Windows files, it will attempt to repair your PC. If your PC isn’t running well, you can refresh it without losing your personal files.
1� Select [Settings] 
on Desktop, then “Change PC settings” to enter PC settings main page > General > Refresh your PC without affecting your files, and click [Get started].
2� It will show the changes which will be made during the process. Click [Next] to continue.