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If there is already an ethernet port on the back of your pc, then the chances are that the drivers are already installed. You can check by looking in ,
start/control panel/system/hardware/device manager/
If its installed it will show up under network adapters, if its not then you may find that you have a yellow exclamation mark next to an adapter there.

To switch between USB abd Ethernet I just have to change the cable , and reboot the modem , sometimes the pc. Everything is auto detected for me.
If you can give some details about the type of ethernet interface you have, (if its on board then we need the motherboard make and model, or stand alone etc then the make and model of the card) , then I or someone else can point you towards the right drivers.

Regards


If you fancy looking yourself, they can be found on the website of your pc manufacturer, or ethernet card makers site.