Read this tutorial, don't use Jungleflahser to get the key. Use Xtracter Reader -
http://www.tiaowiki.com/w/Xbox_360_Lite_On_DVD_Key_Dumping_-_TIAO%27s_USB_Key_Extractor
This is the driver for Windows 7/Vista -
http://www.tiaowiki.com/download//file.php?id=14
You can check for continuity existing between the USB extractor needle and the USB connector using a multimeter.