The User Profile Service service failed the logon. User profile cannot be loaded.

  • Sign into another Windows account.
  • Run the registry editor.
  • Navigate to HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList.
  • Look at the sub-keys here in the form of S-1-5-21-XXXXXXXXXX-XXXXXXXXXX-XXXXXXXXXX-XXXX.
  • One of them is probably duplicated with the extension “.bak.”  Remove (or backup) the one without the .bak, and then rename the remaining one, removing the .bak extension.

I run the windows backup program to backup my user profile to another drive daily and I think if this backup process is failed or interrupted, the error may occurred.

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