WordPress site is hacked. Pls help

Hi,

I think my wordpress (3.1) site was was hacked.

I see on the top of every .php file a php comment like this:

[Code moderated. Please do not post hack code blocks in the forums. Please use the pastebin]

My website were running at http://www.energiakoi.com, now is down and there is the error: Parse error: syntax error, unexpected ‘}’ in /home/energiak/public_html/climaline/wp-includes/kses.php on line 1419

Can anyone help me please…