I think you've got all the proper files in place.... as threads itself is working.
It seems as if the database isn't right.
You might have needed to dump all the tables in the database, then do the install. If you installed and it tried to create the tables on top of the others, it might have screwed it up. The threads files seem as if they are installed OK.
Don't know what kind of access your host gives you to the database. You might ask them to give you a "fresh clean" database, then run the createtable script and you should be all set.
