Hi,
First of all, remove the picture with the Windows product key!
Not a problem if you turn off and on the computer (restart) because this is the finale phase. The installation will continue from the last completed step.
It is likely, have a problem with the hard drive. If the problem persists, test the hard disk for bad sectors.
If there is problem with installation, you can start recovery process again like this - press and hold 0 (zero) key and then switch on the laptop, it will start with the Toshiba HDD Recovery Utility screen or you can select HDD Recovery from the boot menu (F12).
Regards.
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On a C850, you go Windows key/Restart,..hold the Shift key as you click restart & keep holding until you see the reset option screen
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