If you install joomla to a sub-directory ie: wwwroot\joomla the installs and runs fine without any issues.
But if you decide you want to install joomla to the wwwroot you will have issues installing and running joomla. It appears there are some permissions that you must change for this to work correctly.
You can correct this issue, by using the file manager in DNP and changing the permissions on the yourdomain.com folder (above the wwwroot) for this website. Once in the file manager, click the lock icon and you can view the permissions for the yourdomain.com folder, just enabled read / write permissions for the yourdomain.com user and click set permissions.
Joomla will now run from the wwwroot folder.