|Why do you feel you need to do a restore?|
"I have heard this can be achieved by pressing f8 while starting the laptop"
That will bring up the Advanced Boot Options menu where you can select Safe Mode, Safe Mode with networking, Last Known Good Configuration, etc.
If you wanna reset to factory defaults using the hidden recovery partition, press & hold the zero (0) key immediately at bootup & the Toshiba Recovery Wizard will pop up. I don't recommend it though...you will lose everything. Better to try to repair your current setup 1st. The recovery method should be a last resort.