RTEC1

I have Windows 7 PC connected over USB cable to the R-15M speakers, been working great since I bought them but after using another USB device (RTL-SDR) the SPDIF Interface went away (disappeared from Device Manager) and now each time i plug them back to the PC, windows only recognizes them as a Generic USB and obviously no sound since its not the correct device driver. Can you post a link to the actual driver I can download to point WIndows to to load? thanks!