just devide the line:
Code:

 $objDomain = GetObject("LDAP://" + GetObject("LDAP://rootDSE").Get("defaultNamingContext"))


to search the error:
Code:

 $rootDSE = GetObject("LDAP://rootDSE")
 @error ?
 $defaultNamingContext = $rootDSE.Get("defaultNamingContext")
 @error ?
 $objDomain = GetObject("LDAP://" + $defaultNamingContext)
 @error ?
_________________________
!

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