So I made a model, my arena, if you know of it, and it says it had 64 bones, which is the max as an error. How do I get rid of them? I don't even know where they are!

Post a picture of your XSI tree make sure it shows all the parts of the model

Post a screenshot of an Explorer window showing your hierarchy with the "Objects Only" filter on, i'm guessing you have a null as a parent for each object in your model, if so then you could merge all of your objects and delete the remaining nulls or cut each of your polygon objects from their parent null and then delete the nulls, I seem to recall something like this happening with a scene that Linus was working on a while back.
But I/we can't really tell you what's going on until you provide more information.