Delete the Dreamweaver Cache file from the users configuration folder:
common_installation_issues.pdf
the quickest way to uninstall your extensions is to rename the Users Configuration folder and have Dreamweaver recreate it.
When you reinstall the extensions, Use the CSS Form builder 2.01 HTML Editor Compatibility version available in the download center.
If you are installing both Form Builder and Form Toolkit, install Form toolkit before installing Form Builder.
If you are installing HTML Editor 3, Install the CSS Form builder 2.01 HTML Editor Compatibility version Before you install HTML Editor.
After installing extensions, it's a good idea to Delete the Dreamweaver Cache file from the users configuration folder before loading Dreamweaver.