Someone else added a device to my computer somehow.

Hi, I'm new here. I have some jerk who follows me around and does things to my computer. He likes to change my passwords and other annoying things like that. Today I got a notification from Bitdefender that it was protecting the new device being installed on my computer, but I didn't install any new devices. How do I find this device, which might be something bad from the jerk who follows me around, and deal with it?

Thanks for any and all help.

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