Error 403 while running PHP programm

[dot_net_help]

i run jsut helloworld programm in php and error i m getting is

"HTTP Error 404.3 - Not Found
The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map."

although i have server side includes checked in Applicatiopn and development features (in win 7) and have error as it http://www.webune.com/forums/windows...not-found.html