I downloaded the SMF forum zip code & placed in sites/all/modules
then I opened the sMF forum settings page. It is giving following error --

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'smfforum_admin_settings' was given in C:\xampp\htdocs\drupal-5.7\includes\form.inc on line 218.

Please look into it asap

Thanks-