ok, did you add these lines to http.conf ?
LoadModule php5_module modules/libphp5.so
# <<< I am assuming windows would be c:\progra~1\php\modules\libphp5.dll or something idiotic like..
# << or so as such c://program
# << You'll have to play with it to find out, or RTM.
AddHandler php5-script .php
AddType text/html .php
DirectoryIndex index.php, index.html
AddType application/x-httpd-php-source .phps