Warning: Cannot modify header information

Hello ..

I’m really having some problems with my site, i can’t access the ADMIN page..

http://www.nossofuturoroubado.com.br/portal/wp-admin/

I’ve tried all the info in the links below, but the error persists…

I’ve checked the beggining and the end of the php files, i’ve deleted the theme, i added some info, but no success..

PLEASE HELP ME.. i’m new to wordpress..

http://ww.wp.xz.cn/support/topic/warning-cannot-modify-header-information-39?replies=4
http://www.themepremium.com/wordpress-problem-wp-includespluggable-php-on-line-865-solved/
http://ww.wp.xz.cn/support/topic/wp-includespluggablephp-on-line-866-can-not-solve-it-at-all