Hi Robby,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
Before cleaning the Protection history, kindly scan for viruses & malware with the free Malwarebytes to be assured your computer is clean and safe:
https://www.malwarebytes.com/mwb-download
Then, to remove a Protection history, go to the below directory:
C:\ProgramData\Microsoft\Windows Defender\Scans\History\Service > Delete all the files inside it and restart your computer.
You can find more steps to disinfect your computer:
https://answers.microsoft.com/en-us/windows/for...
Please do not hesitate to ask if you need further assistance.
Stay safe.
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