Press and hold the 0 key while powering on the laptop. This will bring you to the Toshiba HDD Recovery screen. If you are wanting to run a factory restore.
But the question still is, why are you wanting to run a factory restore?? Are there other problems you are trying to fix?
If you are successful in your recovery, then I highly recommend you create your factory restore cd's from within windows once it is completed. This will give you the assurance that when they HDD dies, you can install a new one and have you factory software on hand.