Use the set of recovery discs which you (should have) made when you first bought your laptop.
If you didn't bother making any, you can order a set from Toshiba via their website:
Europe: https/backupmedia.toshiba.eu/
USA: https/support.toshiba.com/repair
(scroll down to "Get Recovery Media", enter your laptop's serial number, then click "Go").
Use the set of recovery discs which you (should have) made when you first bought your laptop.
If you didn't bother making any, you can order a set from Toshiba via their website:
Europe: https/backupmedia.toshiba.eu/
USA: https/support.toshiba.com/repair
(scroll down to "Get Recovery Media", enter your laptop's serial number, then click "Go").