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#11
Hi.
I would do as Borg suggests and reset the router. Once reset, change the default logon credentials, (usually at 192.168.1.1 and "admin/admin"), then setup your wifi with a unique name, and secure password using WPA2-AES encryption. Make sure SPI and NAT are turned on. Then turn off WPS if that feature is available in your router (it's insecure). Also turn off any guest networks. Then check online for any firmware updates, because they may have fixes for security holes. If you have any "smart home devices", they could be infected - botnets have infected even smart refrigerators in the past, so take care to get all these items out of the loop so you can concentrate on your computers.
There is a firewall monitoring program called Glasswire which can help you to block certain connections:
Download Firewall Software by GlassWire
The ACPI x64-based PC you're seeing in Device Manager is your computer.