Nios II : USB/Blaster not found (windows 8)

Hi,

I want use Nios II but my De0-nano is not found (USB/Blaster)

- I have Windows 8.1

- The USB-Blaster is found on system (peripherals)

- I have the USB-Blaster on Quartus 13.0

- I have a SD reader then I desactived it

Thanks for your help

Jennifer

ps; i will try to use the 15.0 version, may be !!!!