you have to create bootable pendrive using rufus with https://www.hirensbootcd.org/download/
image. And then boot from pendrive and from there you can reset the Admin password.
direct link to download ISO - https://www.hirensbootcd.org/files/HBCD_PE_x64.iso
Steps to create bootable USB - https://www.hirensbootcd.org/usb-booting/