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 uninstall and reinstall the extensions.
after installing Free tools, make sure the WebAssist installer launches when you restart DW, you may need to open a php page to force it to launch, after the WebAssist installer completes, restart DW.