Edit your registry key:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\DontDisplayLastUserName, then change the REG_SZ value to "1"
That should do it. A good security reference web site is:
www.labmice.net/articles/securingwin2000.htm
Oh by the way you posted this in the wrong forum.
JC-------<*){{{>{~~~~~
Fisher of men