Try this: Settings, System, Storage, Free Up Space Now. Much faster than Disk Cleanup. Storage Sense (immediately above Free Up Space Now) will also do it automatically.

Brink, wanted to let you know your post is applicable to multiple Win 10 peer networking issues and should be linked to multiple threads in the forums. Here's why: I've had multiple PC's on my home...

Looks more like a BT phone jack than an ethernet RJ-45 jack. As Blizzard UK mentioned, it's 10 pin instead of 8. Also, it's not a female port, you can't fit a male RJ-45 plug into that.