Toshiba CL10W User Manual page 37

In addition, if you use a third-party partitioning program to reconfigure the
partitions on your internal storage, you might find that it becomes
impossible to set up your computer.
Make sure that the AC adaptor is connected during the restoring process.
When you reinstall the Windows operating system, the internal storage will
be reformatted and all data will be lost.
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User's Manual
Click Start -> Power and then select Restart.
Hold down 0 (zero) key and then release this key one second after the
computer is power on.
Select Troubleshoot -> TOSHIBA Maintenance Utility -> TOSHIBA
HDD Recovery.
Follow the on-screen instructions to finish the recovery.
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