[Solved] deploying codeigniter application

thank you all for your anserwers. I resolved the problem.
As mwhitney wrote,

This is usually controlled by the AllowOverride directive in an Apache .conf file.

I checked the configuration file. In the past time, I've modified only apache\apache2.4.9\conf\httpd.conf.(with override all and allow from all)
But now I also modify this file apache\apache2.4.9\conf\original\httpd.conf with the same option.
Other modification:
I change in httpd.conf this line

Code:

<IfModule dir_module>
   DirectoryIndex  index.php index.php3 index.html index.htm
</IfModule>

To

Code:

<IfModule dir_module>
   DirectoryIndex  index.php3 index.html index.htm index.php
</IfModule>

I restart wamp and it work fine. I hope my reply can help those who have the same problem.