Hacker removed me as administrator. Now I'm locked out

[Madwrapper]

Hacker has taken control of my all in one PC 

[Bill_To]

Hi

Don't connect the PC to the internet. I would also closely monitor any financial institutions for security breaches. Especially if you conducted online finances with this PC. I would set up a new email account. Change user names and passwords for all accounts you have accessed using this PC.

You will have to reinstall the operating system and will lose all data. Don't know if I would trust the storage drives and MB in this PC.

There are some sophisticated attacks in the wild when a network infiltration occurs. Some attacks can insert malicious code in the MB firmware which bypasses Secure Boot. Not saying this is your scenario.

I don't know if I would ever place my full trust in the PC again.