But when I launch SDRSHarp it says "no device found" and when I launch HDSDR it says "No RTLSDR devcies found" in the "EXT IO" start up dialogue.
If I look at Device Manager I see a USB device called Bulk In Interface (Interface 0) and clicking on this and bringing up driver details gives me three entries with WinUSB first, then WdfCoInstaller01011.dll next and WinUSBCoInstaller2.dll last.
So looks OK, but not actually found by any of the SDR software. I have uninstalled and re-installed hardware, deleted and reloaded drivers, run thru the instructions from a cleaned machine 3 times, each time zadig finds the device, says driver installed successfully but still cannot use it with SDRSharp of HDSDR.

Help please