the admin username and password are stored in the wa_settings table of the PowerCMS database, double check the values in the database, you could also change them directly in the DB.
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.