Do you get those errors when you try to actually install Moodle, or when you try to open the Moodle code in Dreamweaver?
dwsync.xml is a Dreamweaver project file and is created by Dreamweaver when you create a project. It's not part of the Moodle code, so it doesn't affect how Moodle operates. If Dreamweaver is complaining about those .xml files being missing then perhaps something is wrong with your Dreamweaver installation. (You should also configure Dreamweaver so that it puts those "project files" in a specific directory outside the Moodle codebase.)
Lastly, your subject line says, "Installing moodle from Dreamweaver". What does that mean? You can't install Moodle from Dreamweaver. You install Moodle on a web server.