I did write to Marantz in United Kingdom and complain, They answer me this-~~First of all, Sorry for the apparent unresponsiveness. As the USB-Driver is fully Windows 8 compatible, I assume something went wrong with the installation. Please make sure the SA8005 is NOT connected when installing...

Having the same problem, been trying windows vista, win7, win8. same problen on everyone Have been trying to Contact Marantz, but they only sending me around without giving me any answers Hope to read something positive in here soon.