Ya he comentado en php.ini:

[PHP]

;;;;;;;;;;;;;;;;;;;
 ; About php.ini ;
;;;;;;;;;;;;;;;;;;;

;extension=php_oci8_11g.dll
extension=php_openssl.dll
;extension=php_pdo_firebird.dll

Las variables del sistema están bien.

PHP versión 5.4.16:

  C:\wamp\bin\php\php5.4.16\php.exe

Agregar a la variable de ruta del sistema:

  C:\ProgramData\ComposerSetup\bin

Pero, recibe este error:

Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The openssl extension is missing, which means that secure HTTPS transfers are
impossible. If possible you should enable it or recompile php with --with-openssl

Estoy usando:

ventanas 7Wampphp 5.1.16apache 2.4.4

Cómo resolver este problema, por favor ayúdame.