VirtualHost on Bitnami WAMP Stack doesn't work

I'm on Windows 7. I followed all the rules to make working the virtual host on Apache and It doesn't.

I've set on the hosts file :

127.0.0.1 drupal.dev

I've set on the httpd.conf file :

# Virtual hosts
Include conf/extra/httpd-vhosts.conf

I've set on the httpd-vhosts.conf :

<VirtualHost *:80>
    DocumentRoot "C:/Program Files/BitNami WAMPStack/apache2/htdocs"
    ServerName localhost
</VirtualHost>

<VirtualHost *:80>
    DocumentRoot "C:/Program Files/BitNami WAMPStack/apache2/htdocs/drupal" 
    ServerName drupal.dev
</VirtualHost>

When I enter the URL drupal.dev, that shows me the welcome page of Bitnami WAMP Stack but not the page of my website.

Why ? Could you help me ?