(1), before entering the system boot, press F8, enter the Windows 10 advanced startup options, select "Repair your computer."
(2) select the keyboard input method.
(3) If there is an administrator password must be entered; if the password is not set, direct "OK" button.
(4), after entering the system recovery options, select "Dell DataSafe Restore and Emergency Backup."
(5), select "Choose other backup systems and more options" and click "Next."
(6), select "Restore my computer" and click "Next."
(7) After choosing the right factory image, click "Next" can begin to restore the system to factory condition. Note that in the recovery process, the need to connect the notebook adapter. When finished, restart the computer.
Note: Different brands machine operation is not the same as the author's computer is Acer's notebook. Need to restore the system, press Alt + F10, and then follow the prompts on it