|If your brother was having problems with HIS laptop, why would he change the settings in YOUR computer? They have nothing to do with one another.|
Why do you even need an ethernet adapter? The E4300 already has a built-in network/ethernet port.
And the error is message is probably "the device driver is corrupted or missing... code 39"
IMO, the adapter is completely unnecessary...you should be using the built-in ethernet port. All you need to do is install the network driver that's available at the Gateway website: