Are you using a USB to serial adapter? If so, have you downloaded and installed the latest drivers for that adapter (if the Elecraft KUSB the drivers are from FTDI). Reboot the computer after installation.

Use a USB port on the computer, not on a hub.

73,
Don W3FPR

On 4/15/2019 3:54 PM, w4sc wrote:
Having trouble with Win10 and K3 Utility communicating with K3.  Latest K3 
utility, and have tried 2 different Win10 machines, all latest updates.  Tried 
lower/higher speeds, no joy.  Works FB win7.   (tnx again Microsoft!!)  Ideas 
anyone??
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