Do you have any firewall, security or virus scan software running while running the extension?
Did you install using the same user that you are running it on? Are you installing on the Administrator user?
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.