same problem here :(
I copied WAFV_Required_C.js to
C:\Program Files\Common\Adobe\Installers\[Adobe Number]\Adobe Dreamweaver CS4\Configuration\Commands\
which did not fix the probelm. I do not have a directory called
C:\Program Files\Common\Adobe\Installers\[Adobe Number]\Adobe Dreamweaver CS4\Configuration\Behaviors\Actions\WA Validation Toolkit\Apply Client Validations
on my PC. I'm using XP pro.
Thanks for your help!