Windows 7 not detect arduino yun

I’ve tried to power on the Arduino board and connect to it using the Arduino IDE via the USB cable. But it seems that the port of the Arduino Yun cannot be detected at all as shown in the picture attached.

I’m using Window 7 64-bit and the Arduino IDE used are of version 1.6.5.

Is the arduino yun faulty ?

Please help.

Thanks.

Have you installed the board package from board manager ?

If it asks for permission to install any drivers you must say YES