Windows 10: Standalone computer on unknown network

I recently discovered that my standalone pc, which has never been on a network, has somehow became a user of an unknown domain. I utilized clean all cmd on my ssd and performed a clean windows install from usb created by Windows Creation tool and it's still infected. I noticed that DCOMlauncher service is running and greyed out, making it unchangeable. Is there a particular virus that behaves as such, or can someone please help me figure this out? I would greatly appreciate any help or suggestions of any kind. Thank you.

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Unknown computer in my network

I discovered an unknown computer in my network. I can't figure out how to get rid of it. Any suggestions. Has anybody else had this happen to you before?

 

Unknown networks

I have no 'forget' option. They are not known networks, so I can't manage them. They are listed when I select which network of mine I want to connect to, but there are 8-10 unknown networks that aren't mine. They are all checked with 'connect automatically'.
How can I remove these unknown networks from my list?

 

Network devices listed under Unknown in Device Manager


I have a Dell Inspiron M731R laptop upgraded from Windows 8.1 to Windows 10 Home 64-Bit that suddenly quit connecting to the home network. Was using wireless, so switched to an Ethernet cable, but still no luck. I just discovered that ALL of the network-related devices are now listed under an "Unknown" tab in the Device Manager. A check of properties of each item in that folder says they are all working properly, but that obviously isn't the case. I tried uninstalling each of the 4 items, but when they are recognized again they still show up under the Unknown tab. Any suggestions would be welcome.