You can use a Macbook air USB-Ethernet adapter on a Windows 7 machine even though it wouldn't normally find a driver by making a quick hack to the chip driver you can obtain from the manufacturer. It is important to note that I know that there are at least 2 different chips being used in these adapters and this is just one of them. Link to the Driver download page: Signature check disabling: bcdedit /set loadoptions DISABLE_INTEGRITY_CHECKS bcdedit /set testsigning ON Driver modification Line to replace%AX88772A.DeviceDesc% = AX88772A.Ndi,USB VID_0B95&PID_772A Replace with%AX88772A.DeviceDesc% = AX88772A.Ndi,USB VID_05AC&PID_1402.