I\'m using XAMPP for Windows and decided to try out Symfony 2.
XAMPP for Windows
Symfony 2
As soon as I get to Symfony Configuration page it recommends me to
Symfony Configuration
http://php.net/manual/en/intl.requirements.php
This extension is bundled with PHP as of PHP version 5.3.0. Alternatively, the PECL version of this extension may be used with all PHP versions greater than 5.2.0 (5.2.4+ recommended).
also read my comment to your post above