I have been unable to make a USB connection between my NanoVNA V2 Plus4 and my Windows 11 computer. In Device Manager, under USB controllers, a device appears with an exclamation mark and the message, “Unknown USB device (Device descriptor request failed).”  There is no COM port allocation made.

I firstly tried NanoVNA Saver with no luck.  Then I tried NanoVNA-QT (having firstly installed the Cypress driver) and finally I tried NanoVNA-App by One of Eleven.
I guess a driver is needed but what?  Any help gratefully received.  Thanks, Russ.