Good afternoon
I'm new to Drupal, I'm trying to install it but I'm having a little trouble while accessing Drupal from my browser... I extracted Drupal in the /var/www/html directory as said in the installation guid, then modified the .htaccess file as mentioned in that link:
http://www.exp-media.com/drupal7-htaccess-subfolder-tip

and uncommented  the base_url variable, in the default.setting.php:

$base_url = 'http://localhost';  // NO trailing slash!

but in vain, each time I try to access to http://localhost I get the default apache page:

the web server software is running but no content has been added, yet.

What am I doing wrong?

Thank you. Cheers