Hi Philip1519,
Welcome to Sony Community!
I understand that you want this computer up and running. Have you tried to reformat the laptop to see if you can still retrieve the original operating system? You may refer to the link below for the steps on how to do it.
https://us.en.kb.sony.com/app/answers/detail/a_id/35585
The PCG-51211L is the chassis number of the laptop. Please verify if the model number is VPCS111FM by looking at the bezel of the monitor.
You may want to consider buying the VAIO Recovery Disc for your laptop, this contains the original operating system and the drivers and software that came with the unit. Here is the link where you can purchase it.
https://sony.encompass.com/item/8135418/Sony/9-892-008-60/Recovery_Disc
If the model number is not VPCS111FM then this recovery disc is not for your device.
Regards,
Jen
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