I've had the same issue. Window 7 uses prolific drivers. Window 10 can, but it 
a big mess. Go to radio shack and buy their ftdi USB cable. Window 10 has the 
drivers , no need to update. Call me 209. 601.5354

Sent from my iPhone

> On Mar 18, 2017, at 11:44 AM, Ron D'Eau Claire <r...@cobi.biz> wrote:
> 
> Same here. No add'l driver needed. 
> 
> Maybe uninstall the FTDI site, restart the computer and, while connected to
> the internet, plug in the USB device again. 
> 
> 73, Ron AC7AC
> 
> -----Original Message-----
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dick
> Dievendorff
> Sent: Saturday, March 18, 2017 11:23 AM
> To: 'Richard Lawn'; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 not Seen By Computer after OS upgrade
> 
> What I did the first time on several different Windows 10 systems was plug
> in the USB cable and waited (for several minutes) for Windows to find the
> required device driver from Windows Update.  I've never had to install a
> device driver from The FTDI site.
> 
> YMMV...
> Dick, K6KR
> 
> 
> -----Original Message-----
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
> Richard Lawn
> Sent: Saturday, March 18, 2017 10:56
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] K3 not Seen By Computer after OS upgrade
> 
> I bit the bullet and upgrade from Win 7 to 10 this morning in an effort to
> address some issues I just couldn't live with any longer. All was fine until
> I plugged the USB cable from my K3 into the computer and nothing. No
> recognition what so ever. I went to the Elecraft site and downloaded and
> installed FTDI and Prolific drivers though I think it needed FTDI. Still
> nothing. I'm puzzeled though as I downloaded two different FTDI driver
> packages. One was an install package and the other is a folder with no
> obvious setup file for installation. The folder is labeled CDM v2.12.26 WHQL
> Certified. That's probably the one I needed to install but am at a loss in
> how to do that. Some advice would be appreciated.
> 
> Rick, W2JAZ
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