Hello, Sorry for your loss, I know how you feel, as I've been through it three times.
Have you got the manual that came with the PC? If you do and all you want to do is reset the Windows login password,
then all you need to do is consult the manual. It should tell you which pins to change on the PC's motherboard to factory reset the PC. Just as if you were building the PC from scratch. That might solve the problem.