the message you're displaying is telling you that your computer is trying to boot to a network device. Typically this is used in a business environment when an administrator is trying to roll out an image across multiple computers. Also known as pixie boot (PXE).
Can you computer boot into windows at all?
if you, if you go into My Computer do you have a separate partition (to C:) called RECOVERY?
Can you go to Start > All Programs > and find toshiba recovery software here?
when you got the laptop it will have come with instructions for recovery.
Start here: http://support.toshiba.com/
put in your model of your laptop and go to the manual/documents page where it will tell you how to recover.