I did something like this 15 years or so ago using a PS3 internet browser to download a tool and a usb stick to execute!Ahh.
He has this then.
Reset Windows Password With Linux Live CD - OSTechNix
This step by step guide explains what is Chntpw utility and how to reset Windows password using Chntpw with a Linux Live CD.ostechnix.com
I always got the better of my dad on this sort of thing. Good luck OP.