Network scan shows unrecognised computer,

Hello Dirk,
Thank you for contacting AVG Community Support.
We understand that AVG Internet Security has detected a computer "Quanta" while performing the network scan, and you do not recognize this device.
We are really sorry to know this. We'll certainly check and help you out.
We would like to inform that Network Inspector shows which devices are currently connected to your home network, so you can see if anyone is using your network without your consent.
We suggest you to check your computer port if there is any external devices connected and reset your network password of your network and try performing the network scan again, check if the device gets detected under your network.
If you are having any difficulties with changing your network password, please contact your Internet Service Provider to help you with reset the network password.
Thank you and keep us updated.

AVG Network scan revealed a Computer '"Quanta" which I do not recognize. It is listed as "secured".  How do I remove this machine?

Hello Dirk,
Thank you for contacting AVG Community Support.
We understand that AVG Internet Security has detected a computer "Quanta" while performing the network scan, and you do not recognize this device.
We are really sorry to know this. We'll certainly check and help you out.
We would like to inform that Network Inspector shows which devices are currently connected to your home network, so you can see if anyone is using your network without your consent.
We suggest you to check your computer port if there is any external devices connected and reset your network password of your network and try performing the network scan again, check if the device gets detected under your network.
If you are having any difficulties with changing your network password, please contact your Internet Service Provider to help you with reset the network password.
Thank you and keep us updated.