Restart your computer > Once seeing the boot screen, keep typing the key ('F10/Delete/Esc/F8/F12' regularly) to enter the BIOS interface > Enter the 'Windows Preinstallation Environment' according to the prompt of computer starting > Choose 'CD-ROM Drive' or 'USB Drive' depending on your burned disc. Insert the bootable CD/DVD or USB flash drive just burned into your locked Toshiba laptop.
