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Hide user name for the user that has locked the computer:

1. Start Registry Editor.

2. Locate the following key in the registry:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System

3. If it doesn't exist, on the Edit menu, point to New, click DWORD Value, and then add the following registry values:

Value name: DontDisplayLockedUserId

Value data: 1, 2 or 3 (see below)

Base: Decimal

The following values can be set:
1 = Show the locked user display name and the user ID
2 = Show the locked user display name only
3 = Do not display the locked user information

4. Exit Registry Editor.

Note: To prevent the last logged on user to be displayed in the Windows logon screen, also set the dontdisplaylastusername value and set it to 1.