Windows doesn't 'remember' a hardware device once it is disconnected from a computer. Every time you turn the TV on, Windows is recognizing a new device and installing its driver. While it may well be annoying to look at, it's not doing any harm or occupying meaningful space on your hard drive. There's no need to delete them.
This might work to prevent Windows from detecting a new device every time the TV is turned on: Enter your router's configuration utility and reserve an IP address for the TV. To do this you'll need to know the TV's MAC address, which you should see in the router's network map.