You may be able to stop windows 7 from updating the driver, as noted here:
http://support.microsoft.com/kb/2500967

I dont know for sure as I havent tried it.


From: Niklas Johnson <niklas@ruggedradios.com>
To: Discussion of CHIRP <chirp_users@intrepid.danplanet.com>
Sent: Tuesday, May 20, 2014 10:54 AM
Subject: Re: [chirp_users] Summer Project : transcoding CHIRP

Its wrong only if you have a 'counterfeit' Prolific chip, the most recent driver revisions that Prolific themselves provided to Microsoft detects and disables the non-genuine variants. Prolific is protecting their market share and IP, and Microsoft was providing a certified manufacturer supplied driver. 


On Tue, May 20, 2014 at 8:41 AM, Pete Mackie <pete@seaquest.com> wrote:
Except starting with Mac OS X Mavericks Apple is providing an O/S built in USB to serial driver. I am using the Apple provided USB to serial driver with CHIRP with zero problems.

Windows has provides an O/S built in USB serial driver. The dilemma is the stupid Microsoft thinks they should automatically provide the latest O/S built in USB serial driver. And that is absolutely the wrong thing to do if you are using a Prolific USB / serial cable.

Pete

On May 20, 2014, at 8:17 AM, Andrew <ziltro@ziltro.com> wrote:


The drivers for certain USB/serial adapter cables will still be 
required, and they seem to be the main thing causing problems on Windows 
and Mac OS.



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