Problem installing PHP4/IIS isapi

Hi everybody, I've a big problem : I usually use ASP scripts, but if I watch what is done, it seems to be usefull to know how to programm in PHP. So I downloaded php4.3.1 (the zip version for manual installation in isapi modules), to install it on IIS5 on Windows 2000 Server. I unzipped the pack in d:\php I added the association between .php files and d:\php\sapi\php4isapi.dll in the internet services manager on my configured website. I copied the php.ini-recommended to the c:\winnt directory and renamed it php.ini, edited it to change the extensions dir to d:\php\extensions, and the docroot directory to c:\inetpub\wwwroot value. The d:\php directory and its subdirectories and files have permissions "full control" (I appologize : my windows is french and I translate the names without knowing the good english names) for "everybody". The c:\winnt\php.ini has permissions for "full control" for "everybody". When I use the command line "php -i" I can see the appropriate html code that seems to tell that php is running. But when I try to access a page called "info.php" in my webserver using the browser (url : http://localhost/info.php), I get a 500 server error. The file info.php contains only one line "<? phpinfo();?>" (the same file works when uploaded to my online website located by my provider). Could you tell me what I did wrong ? I made all the changes described in the help file and the faq online from php.net website. The only thing I haven't understood is the browscap.ini related instructions. Please help me : I don't know what to do any more ! Many thanks for you ! Stephane.