you can either:
1) open the preset manager and export all presets, then uninstall the extensions and reinstall them to restore the presets
or
2) recreate 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
then reinstall the extensions