I use an older Prolific based KUSB with my Windows 7 64 bit system that I use 
to develop and test the various Elecraft Utilities.  I got my drivers from the 
Prolific web site listed in K3 Utility Help, see Troubleshooting USB to serial 
adapters section. 

Dick, K6KR

On Dec 25, 2010, at 12:57, WILLIS COOKE <wrco...@yahoo.com> wrote:

> Bob, the Prolific converters do not work well with W7.  I have been using W7 
> with my K3 for over a year with a PCIe card RS-232 port.  It worked the first 
> time with no problems.  Elecraf has quit selling the Prolific converter, but 
> the 
> one they were selling two years ago was Prolific.  I think that some are 
> having 
> good results from the FTDI chip set converters which Elecraft is shipping 
> now.  
> You will need the latest drivers which are available from the FTDI web site.  
> Surely Prolific will eventually get their act together and publish a driver 
> which will work with W7, maybe they have by now.
>  Willis 'Cookie' Cooke 
> K5EWJ 
> 
> 
> 
> 
> ________________________________
> From: Robert Redmon <k5sm....@gmail.com>
> To: elecraft@mailman.qth.net
> Sent: Sat, December 25, 2010 2:26:43 PM
> Subject: [Elecraft] Windows 7 64bit and USB to RS232 adapter
> 
> I have a new laptop with W7/64bit and can't get my USB/Serial adapter to 
> work (with my K3). It all works fine on my XP (32bit) computers. Anyone 
> who can help?
> 
> 73, Bob K5SM
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