Windows XP – Hide the drop-down list of domains

To remove the domain drop-down list from the logon screen and force users to use their full user principal name (UPN), perform these steps:

1. Start the registry editor (regedit.exe).

2. Navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon registry subkey.

3. From the Edit menu, select New, DWORD value.

4. Enter a name of NoDomainUI and press Enter.

5. Double-click the new value and set it to 1. Click OK.

6. Reboot the machine.

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