I had the same problem with a 64 bit Win 8 Device. When Plugging the D1 into a USB 3.0 Port I got the same "Not Recognized" error. So I put a USB 2.0 Hub into the USB 3.0 Port basically downgrading the port to USB 2.0 and when I plugged the D1 into that, it worked immediately. The problem seems to be USB 3.0 compatability, at least for me that was the case