If you get a message saying that your PHP installation may be faulty or that you haven't allowed your browser to accept cookies, the problem may well be that your PHP session save path isn't correct.

When you set up the database for your Joomla installation, you probably set up a user to own that database.

However, when the Joomla installer asks you for the database user and password it's really asking for the user that created the database, which is probably the root user. Provide the creating user's name and password, then you should be able to proceed normally.

If you still can't get Joomla to install via the script, then look for the file configuration.php. If it hasn't been created, copy configuration.php-dist to create it and then edit. The settings that really need to be altered are:

  /* Database Settings */
  var $dbtype = 'mysql';           // Normally mysql
  var $host = 'localhost';         // This is normally set to localhost
  var $user = 'root';              // MySQL username
  var $password = '0r4ng3';        // MySQL password
  var $db = 'joomla';              // MySQL database name
  

The other settings can be ignored for the purpose of getting things going and then filled in as you require them.