Please see this topic about hosting the API locally: http://help.arcgis.com/en/webapi/javascript/arcgis/help/jshelp/intro_accessapi.html
Have you given any thought to upgrading to a newer or the newest version of the API?
Make sure follow all of the steps in install.htm that is at the root of the zip file. If that's what you did, and you're still having trouble, it is probably best if you contact support.