Do you still have Logon Studio installed? When you press the "Restore Original XP Logon" button, does a small window pop up saying "Original Logon Restored, Logon Studio will close?".

That's what should happen when you restore the original, and then you can uninstall LS. What happens with your system?

Hmm, I really don't know. If you set it to restore your original logon, it should do that and shut itself down.

Do you or have you used any other logon changing programs? When LS is running, it creates a .logonuiX.exe and XP uses that instead of the original .logonui.exe. When you set it back to default, then XP will use the original .logonui.exe.

You could try reinstalling Logon Studio and try to set to default again, sometimes that will work.

Or if you have Windows Defender, you can go to "Tools", click "Software Explorer", and under the "Startup Programs", disable Logon Studio and then reboot. Create a system restore point first, but that's what I would try. If it works, then uninstall LS.

Other than that, I'm out of ideas. Good luck.

He gave you good advice,sounds like you didnt use it.

Use system restore to go back before you installed Logonstudio.

Why would you format a drive just to get rid of a logon?Seems extreme.Worst case,your stuck with a non XP logon.Try resetting the logon back to default while in safe mode.

Not many here know more about Logons than Boss.

Check out Logon Loader WWW Link

They have a Logon Recovery tool to fix a corrupted logon. I've never used it but you might give it a try.