Hello.
Try to re-install driver and re-boot the PC, try to connect the device to another motherboard's USB port, don't use any USB hubs or PCI USB extention cards, this is important. Try to connect the device on another PC.
Also, please look here:
http://forum.gsmhosting.com/vbb/f699...olved-1612909/,
http://forum.gsmhosting.com/vbb/9010684-post87.html.