If you try to edit the global configuration in Joomla and receive the message An Error has occurred! Unable to open configuration.php file to write! On your serverset the permissions for the configuration.php in the root of the website to enable modify permissions to the Internet guest account. You may also get an error uploading.
This covers setting up a Joomla website on a Windows IIS server You will need to have MySQL installed on the server already. If you do not, use XAMPP to load and configure the packages required from-