Something that works on any hard drive, and allows you to set up a hash to completely overwrite the hard drive where you will have to install a new OS is Acronis. It is a backup software that also allows you to fully scrub a hard drive!! It is almost impossible to recover every bit of data. If a person did run recovery, they would get gobbledygook.

As a reference: I am a retired IT. I have used this extensively.

I am retired Navy IT. I agree that your system was compromised without you knowing. They showed you one instance of then working, while another instance was manipulating your system without your knowledge.

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You need to clear out your system, and acquire a holistic security system for your system. When configured correctly, it will block any unauthorized instances, and let you know they were attempted.

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Be careful out there. Always go to the official site of any company; do not click the link provided!!! It will save you a lot of hassle!!