Toshiba Qosmio DX730 Series User Manual page 120

You can not use System Recovery Options if restoring the pre-installed
software without System Recovery Options.
When you reinstall the Windows operating system, the hard disk will be
reformatted and all data will be lost.
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User's Manual
Turn off your computer.
While holding down 0 (zero) key on the keyboard, turn on your
computer.
A menu will be displayed from which you should follow the on-screen
instructions.
TOSHIBA DX730/DX735/Qosmio DX730 Series
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