Forum Malware problem
 

Hi

I am having a problem with my website www.studentsforum.co.uk when I enter the website I am informed that it contains malware; I have tried a bunch of things like delete all files on the server and re uploading the files and looked through the database but I can't find a dodgy post or anything or identify the point of entry although don't know what I am looking for.

I can't always access the admin area but I have disabled all my add ons in case that was the problem with little look. The blog section always has the problem and now it has: Fatal error: Call to undefined function prepare_blog_category_permissions() in /home/students/public_html/includes/blog_init.php on line 32
Can anybody help me on this to get site back to the way it was before these scumbags decided to ruin it?