restore stolen computer back to factory OS

nmit1962

Prominent
Jun 19, 2017
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i have a Toshiba Satellite C55D-A5120
Part NO. PSCFWU-03H02X
Serial NO. ZD184687Q
the laptop was stolen from me a few years back. A friend of mine just happened to be given the laptop hoping he could unlock it and perform a factory reset. He thought it could have been mine, opened the HDD compartment, and on the bottom of the drive he found my name and partial social #. when i got it back a few ays ago i opened it and found that somebody had wiped the drive and did a very poor installation of an unlicensed Windows 7 OS. Is there any way that I can restore the system back to the original Windows 8 that was factory installed without purchasing a new copy?