Can I save this computer?

[DR_274]

Hi, first time post, not very tech savvy. My daughter had a friend who built her a computer. He had access to every bit of hardware and software on the machine. At the time he was on good terms with my daughter. A few months later he was harassing my daughter in her gaming discord chat. He was seeking information about her. He claims to have downloaded server information, whatever that means. In his last comments he suggested that my daughter reinstall Windows 11, and he suggested it would be bad if port 22 were left open. I disconnected from the internet immediately, but I fear the damage is

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