Did you receive restore discs with your laptop? If not, a lot of manufacturers are actually just installing a program on your system where you can burn your own restore discs. They also sometimes have a second partition that you can access to restore your system to the default state.
If you can't burn your own, most manufacturers can send you some however they typically charge a ridiculous amount. Your best bet would be to find an OEM installer for whichever operating system you have and use the COA(Located on the bottom of your laptop) to do a fresh install of windows. The only disadvantage to doing it this way is that you will need to install your own drivers which you can find on Toshiba's support site.