Well, I got it resolved. After realizing that I couldn't run Repair Install from outside of Windows and before doing a reinstall, I removed the hard drive from the HP and attached it another machine and ran a Malwarebytes scan on the drive. Malwarebytes found and removed the Trojan/Alurean.
I reinstalled the drive on the HP and on boot got a stop code 7B. I rebooted into System Repair Command Prompt and ran bootrec to /fixmbr, /fixboot and rebuild the BCD. With that completed, the machine booted up.
Thanks for all your help and support.