Setting CodeIgniter Database Configuration

this is very use full

HELLO SIR

my localhost not running and not exist path so plz help me

error

Object not found!

The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.

If you think this is a server error, please contact the webmaster.

Error 404

localhost
Apache/2.4.10 (Win32) OpenSSL/1.0.1i PHP/5.5.19