The only time I see a message like that with Logon Studio is if you use another logon program, like StyleXP or Logon Loader, and then open Logon Studio. It will say the Logon Studio is no longer registered as the logon program and ask if you want it to be.

If you click "Yes" it will work fine and you should be able to load the logons in Logon Studio.

I did, it still doesn't work. x.x

I pressed yes, then load, then loaded the theme but it didn't appear on the list, so I refreshed a few times, and it's still messed up. T.T

Do any of the logons that came with Logon Studio work? And which one are you trying to load?

Is it a .logonxp file or a .zip. I need more info to work with.

Yes, the logons that came with it work. ^^ I'm trying to load Caramel Mac. ^^

Caramel Mac Link.

And yes, it's a .logonxp file.

I just tried it, it downloaded and installed fine.

If it is a .logonxp file and doesn't load, try this:

Rename the file from Caramel Mac.logonxp to Caramel Mac.zip.
Unzip the file and put the Caramel Mac folder in C:\Program Files\Wincustomize\Logon Studio.

Then open Logon Studio and it will be in the list of logons.

Sometimes Logon Studio has weird quirks and won't load a logon right on some computers. If that works, you can load new logons that way from now on...a bit of a pain..but it works.

If the logon isn't in the list of logons after you do that, the only other thing I can suggest is to uninstall and reinstall Logon Studio.

Let me know if it works.