How to get computer back to factory settings/operating system?

I have recently bought a toshiba C55t-A5287 laptop and could not stand Windows 8. So I bought Windows 7(I bought it for 20$ at my college) and did a clean install of Windows 7. I have been having problems with the computer, finding drivers and such, and was wondering if it was possible if I could just get the computer back to the OS from which it came from the factory. Unfortunately I did not make a back up of it... Thanks in advance :)