wp-login.php..ERROR: Incorrect password. Lost your password?,

Just install wordpress on my system for the first time, But I can’t seem to login at all, I’m useing the wp-login.php, keep noticeing people mentioning the wp-admin.php, but an checking the file extension in the wp-admin folder I notice that the extension is .CSS and not .php I have tried adding this code /** wp-admin login fix */
@define(‘ADMIN_COOKIE_PATH’, ‘/’); that Seth ridley recommended but still no joy. but still keeping getting this messsage, ERROR: Incorrect password. Lost your password?, I tried taking the password directly from the data base, user_pass & pasting it into the password txt boxs, but with no joy, Help some one.