Most companies now have "support" pages where they tell you how to take a laptop back to factory settings.
Just go to the Toshiba web site and look for the "support" section and search in there for your actual laptop.
Here is one section I found, though it may not apply to your actual laptop
http://support.toshiba.com/support/viewContentDetail?contentId=2737864
p.s. When pressing F8 I find sometimes you need to keep pressing F8 over and over again during start up (before Windows loads). If you only press F8 the once it can either be too early or too late.
She just KEEP pressing and releasing F8 continuously from the moment you power up the laptop.