If you are using a newer computer there are more USB 3.0 device plug-ins than USB 2.0. It was my thinking that the USB 3.0 would be backward compatible with USB 2.0. No so with the Directstream DAC and Windows 7. I was going around and round with the driver and J River when a friend ask if I was plugged in to a USB 2.0 or USB 3.0. I was plugged into a 3.0 it worked but it did not work right. I moved to the USB 2.0 and all became right the drivers and the Directstream work as expected.
I knew the Directstream was working as I have a PS Audio Memory Transport and had listen to the plastic CD’s if you recall those.