Replace .htaccess code with below code
<IfModule mod_rewrite.c> RewriteEngine On RewriteBase /wordpress_test/ RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /wordpress_test/index.php [L] </IfModule>
i hope it's works

on your htaccess use this,
RewriteEngine On RewriteBase /root_folder_name/ RewriteCond %{REQUEST_URI} ^system.* RewriteCond $1 !^(index\.php|images|js|uploads|css|robots\.txt) RewriteRule ^(.*)$ /index.php/$1 [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L]
Hope this helps.