Site Hacked

[carllaponte]

I'm sure your all sick of seeing this topic. I just took over a snowmobile Forum b/c previous Admin lost interest, and it was getting flooded w/ spam. I'm learning but I'm very limitied in my computer skills. I have been watching and deleting spammers out of my Forum trying to clean it up. At this point I have deleted the Spammers that got in and made themself admin's. I have had my site restored, changed all passwords, deleted Install directory, and looked thru the plug ins. My problem is I do not know how to identify if a file should be there or not, and the spammers very well may have a back door into my forum. I have contacted my hosting company and they can't help w/ trying to locate a back door. Is there a service that I can hire to help me with this that will be fair on pricing? any idea on what is even fair w/ pricing? Please help...