Well that points to something wrong with DW. Since you have already deleted the cache and config folder, the only thing I can think of is to re-install DW.
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.