How i can remove the index.php from the url

[eluser]Unknown[/eluser]
I have appache 2.2 and wamp 2.0 and mod_rewrite is enabled on my server but i still facing this problem
the roots is
wamp/www/CI/
CI contains
application/
system/
index.php
.htaccess

.htaccess contains the following
RewriteEngine on
RewriteCond $1 !^(index\.php)
RewriteRule ^(.*)$ /index.php/$1 [L]

and i try to put $config['index_page'] = '';
and iam still facing a problem