Here is the problem:
When you go to your script it automatically changes to the subdomain that you USED to have per the settings. So when you access it at schafers-r.us it goes to the schafers.x10hosting.com address. Since Fed replaced the .x10hosting.com address with schafers-r.us you now see the Domain Available error.
I went into your MySQL database and changed the only setting that I saw from .x10hosting.com to schafers-r.us. Can you let me know if it works for you now?
-Corey