Create the .htaccess file add the code given below and put it into your root directory of the main folder
And please keep this variable $config[‘index_page’] = ‘ ‘; empty you can find this in config.php in config folder
RewriteEngine On
#Checks to see if the user is attempting to access a valid file,
#such as an image or css document, if this isn't true it sends the
#request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
#This last condition enables access to the images and css folders, and the robots.txt file
RewriteCond $1 !^(index\.php|public|images|robots\.txt|css)
RewriteRule ^(.*)$ index.php/$1 [L]
Rahul Rajoria 