Refresh your PC—Attempts to solve system problems by replacing system files without affecting user data files. Still, such files still should be backed up before refreshing. Installed programs will have to be reinstalled except those from the Windows Store. A list of uninstalled programs is provided on desktop. You personalization settings will be maintained. System settings will be set to defaults. A Windows.old folder will be created at C:. You can delete it once you have everything you want from it. Use Window.old Folder - Delete in Windows 8.