• Make sure that the hosting / your pc mod_rewrite module is active. if not actively try to activate in a way, open the httpd.conf file. You can check this in the phpinfo.php to find out.

#LoadModule rewrite_module modules/mod_rewrite.so

LoadModule rewrite_module modules/mod_rewrite.so

• then go to .htaccess file, and try to modify to be:

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)\?*$ index.php/$1 [L,QSA]

RewriteEngine on

# if a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# otherwise forward it to index.php
RewriteRule . index.php

• move .htaccess file to root directory, where is index.php thare.

www
 - protected
 - index.php
 - .htaccess

• Set main.php in your yii configuration, at component :

'urlManager'=>array(
    'urlFormat'=>'path',
    'showScriptName'=>false,
     'caseSensitive'=>false,        
),

and then try the following url

http://localhost/yii_framework/?site/index

Good Luck ! :)