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Leon,
Updates happen pretty often with Microsoft systems. There has recently been quite a few big catchups for various security fixes which if you want to stay safe you need to allow.
If you leave the PC on and WiFi connected then these will download in background and install will happen. You may see various warnings and update notices at a reboot.
If the PC is turned OFF you should see no traffic through the router, just the occaisonal blip as it maintains contact with the outside world.
Do you have your WiFi secured and protected by a password ? If not someone nearby could be leaching data, ie using your connection.
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