script to join domain

I have this script that i got from microsoft script
center. It is supposed to join a client to the domain.
They claim it is designed for XP and 2000. When i run it
i get this error "Object dosent support this property or
method objComputer.JoinDomainOrWorkgroup". I am just
learning scripts and not sure what my problem is. Thanks.
Const JOIN_DOMAIN = 1
Const ACCT_CREATE = 2
Const ACCT_DELETE = 4
Const WIN9X_UPGRADE = 16
Const DOMAIN_JOIN_IF_JOINED = 32
Const JOIN_UNSECURE = 64
Const MACHINE_PASSWORD_PASSED = 128
Const DEFERRED_SPN_SET = 256
Const INSTALL_INVOCATION = 262144

strDomain = "FABRIKAM"
strPassword = "ls4k5ywA"
strUser = "shenalan"

Set objNetwork = CreateObject("WScript.Network")
strComputer = objNetwork.ComputerName

Set objComputer = GetObject("winmgmts:
{impersonationLevel=Impersonate}!\\" & _
strComputer & "\root\cimv2:Win32_ComputerSystem.Name='" &
_
strComputer & "'")

ReturnValue = objComputer.JoinDomainOrWorkGroup
(strDomain, _
strPassword, _
strDomain & "\" & strUser, _
NULL, _
JOIN_DOMAIN + ACCT_CREATE)

> [snip]

I can't help you with the error you're getting, but I sure hope that
this....

> strDomain = "FABRIKAM"
> strPassword = "ls4k5ywA"
> strUser = "shenalan"

.... isn't your password. If it is, I would highly recommend changing it
right about now.