Declare Function CreateProcessWithLogon Lib "Advapi32" Alias "CreateProcessWithLogonW" (ByVal lpUsername As Long, ByVal lpDomain As Long, ByVal lpPassword As Long, ByVal dwLogonFlags As Long, ByVal lpApplicationName As Long, ByVal lpCommandLine As Long, ByVal dwCreationFlags As Long, ByVal lpEnvironment As Long, ByVal lpCurrentDirectory As Long, lpStartupInfo As STARTUPINFO, lpProcessInfo As PROCESS_INFORMATION) As Long

Если функция равна 1, то все в порядке.

Подробное описание лежит здесь:

http://www.google.com.ru/search?q=cache:Ltlf1IsDB1UJ:www.mentalis.org/apilist/CreateProcessWithLogon.shtml+createprocesswithlogon&hl=ru&ie=UTF-8

Удачи!!!