Johan, Also, you should have libusb0_x64.sys on your system and NOT libusb0.sys. However, both KISS and PowerSDR are 32 bit applications, so they use libusb0.dll and DO NOT use libusb0_x64.dll. The DLL files belong in each application's binary directory. The .sys file belongs in the driver directory. 73, George K9TRV 1357586794.0