Strange issue

[Kiran-E-Sehar]

Thanks ozzy47 i did the steps as you told, but unfortunatley when i tried to sign in to admin panel, it was successfully signed in but then its redirected back to login page of admin panel
and when i tried again i got the wrong password error again as well

after that i reuploaded tools.php but this time i am getting internal server error error:500

--------------- Added [DATE]1382973475[/DATE] at [TIME]1382973475[/TIME] ---------------

i tried disabling hooks with this command in config.php
define('DISABLE_HOOKS', true);
now i opened forum and got this error
define('DISABLE_HOOKS', true); Unable to add cookies, header already sent.
File: /hermes/bosoraweb127/b1325/ipg.httpdeveloper/www.kiran-e-sehar.com/forum/includes/config.php
Line: 2
here is the link
http://forum.kiran-e-sehar.com
link for tools.php
http://forum.kiran-e-sehar.com/admincp/tools.php

--------------- Added [DATE]1382974158[/DATE] at [TIME]1382974158[/TIME] ---------------

ok what i tried now, used link without www
and i got logged in to admin panel succussfully

any idea what is the problem with www....

--------------- Added [DATE]1382974312[/DATE] at [TIME]1382974312[/TIME] ---------------

even after logging in i tried www.forum.kiran-e-sehar.com and its showing that i am not logged in, then i opened with http://forum.kiran-e-sehar.com and its showing me as logged in