Toshiba Satellite Pro C870 - Manual (Page 125)

When you reinstall the Windows operating system, the hard disk may be
reformatted and all data may be lost.
1. Turn off your computer.
2. While holding down 0 (zero) key on the keyboard, turn on your
computer. Release the 0 (zero) key one second after the computer is
power on.
3. A menu will be displayed from which you should follow the on-screen
instructions.
If your computer does not load the Recovery options, please refer to the
Troubleshooting section.
You can also perform the restoration through PC settings in the operating
system:
1.
Click the Settings charm and click Change PC settings.
2. Click General under PC settings.
3. Select the options you desired and follow the on-screen instructions.
User's Manual 5-20