We have a topic that is causing problems. Whenever someone tries to access it, the page times out. It's the only topic on the entire site that does it and we want to remove that one topic entirely (or at the least delete the users post).
How about use phpmyadmin to check, repair, and optimize your tables? You can also delete it that way if you have to (but may be tedious to do so -- must search out all posts in that thread and delete the title).