Problems running php4 on IIS

Hi, I am new to PHP I have installed PHP4 files for running with IIS 5.0 on Win2K. .php extension is mapped with %systemdir%\inetsrv\php\php.exe %s %s I have modified my php.ini file so it can find the extension dlls I have written a small php script containing some inline text and an echo command Then i tried to access it thru my web server. It answered (translated from french): <<CGI Error the CGI application did not worked : it didn't send complete HTTP header, Headers sent are :>> and there's nothing following that line I tried to specify some headers in my php file using header command. I got the same page. Is there something i missed ?! Thanks for any help, Olivier Marty