help needed after hack…

Hi !

My site was hacked through a phpbb security breach (still not sure how). I managed to fix the problem more or less but the trouble is that any page requested on my site is redirected to one that was inserted on my site. I cannot remove it or it blocks the site (error 500). I am not familiar enough with the work of a server and I would need some help : where should I look ? Any request made on my site (index.htm, search.php…) is redirected. Where is taken the decision that a request for index.htm should go to home/public_htm/index.htm ?

Any help against this hack would be greatly appreciated !

Thanks a lot in advance !!!!

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