I am having similar problems to others. I have setup Guestbook in my page feedback.html

I have published but the guestbookdb does not appear. There is a guestbook.php. Maybe php is not installed??
Error:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@jacklovelock.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.8b mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.jacklovelock.com Port 80