Open the Registry Editor (Regedt32).
Select the HKEY_LOCAL_MACHINE key.
Navigate to the subkey \Software\Microsoft\WindowsNT\ CurrentVersion\Winlogon.
Go to Edit | New | String Value.
Enter DontDisplayLastUserName for the string's name.
Double-click the new string to edit the value.
Change the value to 1, and click OK.
Exit the Registry Editor.
Try Admin Tools - Local Security Policy - Local Policies - Security Options.
Look for the key "Do not display last user name in logon screen".
I think this is the "snap-in" method of editing the registry (and therefore is possibly safer).
(Note - this can be over-ridden by Group Security Policy.)
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