All laptops / computers have BIOS. They wouldn't start otherwise, yours is simply not visible on start up. Try tapping Del or F2 or F9 and it may get you into the BIOS
Once there select CD/DVD drive as first boot option, ensure disc is in and "Save settings and exit" this will re start laptop and boot from disc.
Someone with a Toshiba may know the correct key or read your laptops manual.