403 Forbidden error after installation

i think u r using godaddy hosting . if yes then u need to have one more file with the wordpress files. i.e. index.php . make a file of this name having content as below and upload it over the root directry there. the problem eill b resolved.
copy the below content and save it as index.php and upload.
file content starts here
<?php
/**
* Front to the WordPress application. This file doesn’t do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/

/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define(‘WP_USE_THEMES’, true);

/** Loads the WordPress Environment and Template */
require(‘./wp-blog-header.php’);
?>