Refresh and restore.
Previously if your system was hanged or attacked by viruses or it developed many unwanted settings, the only way to remove them was to format your C drive and load a new Windows OS through any removable drive.
But in this case user definitely gonna love Windows 8. It will allow you to refresh your settings to original form without deleting your data just by clicking on ‘Refresh’ button in settings menu. Click on restore if you want to format your system, but after formatting it will automatically reinstall the Windows OS.
NOTE:- Some feature can be absent sometimes, it depends on the configuration of your system.