On the two PCs that I used I don't believe there ever were any similar drivers, but i did remove (I think I did, anyway - I'm not very computer saavy) the originally installed Topping drivers, re-install and reboot. Same result. I also tried this unit on an Ipad, because as I understand it Apple products are not supposed to require drivers for this unit. Same result. I was running out of time for the 30 day refund, so I sent the unit back to Blinq, and they cheerfully and promptly refunded my $212.50, and even paid for return shipping. (It was sold as a "like new" unit). Performance through optical was outstanding, and was best of all driving Monoprice M1060s directly with no amp. Get a monoprice adapter with two male RCAs going to a stereo mini female. That way you have eliminated a cable and possibly a quarter inch to eighth inch adapter. I will probably try another unit and see if it does usb and DSD. Many thanks to those who tried to help me.