Factory reset or formatting the drive might not take care of any sneaky viruses they were able to install. If you keep the computer, you want to use a tool to completely overwrite all the data on the HDD like
https://dban.org/. Then you can reinstall from a DVD with the OS, or if you don't have a DVD, download the installation media from Microsoft and put it on a thumb drive:
https://support.microsoft.com/en-us/...f-40c3b507420d. This is being extra-paranoid, but I would create the installation media on a different PC than the one that got hacked.
You'll need your product key (20 digits and letters, or maybe it's 25, I don't remember) to activate Windows. For some computers, typically corporate purchases, this is actually part of your hardware and Windows will pick it up automagically. For other computers, you might have a key on a sticker on the back / underside of the computer, or with your manuals. If you don't see it anywhere, you should be able to get it from the registry, but that's getting above my paygrade.
You should run a virus scan on every computer on the same network - again, don't know how sophisticated they are, but maybe they were able to infect other devices in the household. Then, as others have said, change every password that might have been compromised.
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