My Mistake, server validation is a part of Security Assist. try uninstalling security assist, then install it again.
you might also want to try recreating the users configuration folder as outlined in step 12 of the Adobe troubleshooting guide:
http://helpx.adobe.com/dreamweaver/kb/troubleshoot-javascript-errors-dreamweaver-cs4.html#main_user_config
After renaming the configuration folder, open DW to recreate it, then open the extension manager, uninstall all extensions, then install them again.