Re: tikiwiki failed
If you have phpMyAdmin access to your Tiki database, you can easily fix the tiki_articles table, which needs to be repaired. Navigate to the tiki_articles table, click "Operations" and then "Repair table." This should fix your Tiki and he/she should work normally once again.
If you don't have direct access to the database yourself, then I guess your server admin, etc., will have to do the repair.
-- Gary - zukakakina.com