Hi Ashton,
Thank you for writing to Microsoft Community Forums.
I understand that the Virtual Machine is not booting automatically.
As you have mentioned that you have changed the registry settings and account settings for the virtual machine, but the issue persist, in this case I would suggest you to post your query on TechNet forums, as they provide dedicated support for issues related to Virtual Machines on Hyper-V.
Regards,
Prakhar Khare
Microsoft Community – Moderator