Put it in your root forum directory, not the admincp. Run it like this:
http://www.canarybreeder.net/up/forum/table_repair.php
It's a simple file that I wrote that will only run that one query to repair that table. It should give you a simple blank page. Check to see if everything is working again. If not, run it again. If it still isn't working, let me know.
You should probably delete the file from your forum directory after you are done with it as well.