I had run the App Installer for phpBB3 to a /forums application start location. Everything copied over OK (verified through FTP), but I am unable to access either the forums or the install/index.php file. I get a http 500 error. Any idea why this may be occuring? I have also tried to load the software manually by downloading it from phpBB3 directly and copying it over through FileZilla, but I get the same issue. It's almost as if my site is not dealing with php properly.
Have you made any changes to the default document settings? http://support.Winhost.com/KB/a593/can-i-specify-the-default-document.aspx