Create A Hidden User Account
This tweak allows an account that is
normally displayed on the Welcome screen to be hidden from view. To log
on using the account it's necessary to use the Log On To Windows dialog
box similar to the one in Windows 2000. #[Start] [Run]
[Regedit]#Registry Key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\SpecialAccounts\UserList#Modify/Create
the Value Data Type(s) and Value Name(s) as detailed below.#Data Type:
REG_DWORD [Dword Value] // Value Name: Type Name of Account to be
Hidden#Setting for Value Data: [0 = Account is Hidden / 1 =
Enabled]#Exit Registry and Reboot...

While the account is hidden
on the Welcome screen, note that the account profile will be visible in
C:\Documents and Settings or wherever user profiles are stored as well
as in Local Users and Groups