Option Compare Database
Option Explicit

Public Function WMI_INSTALADO() As Boolean
'http://www.microsoft.com/latam/technet/articulos/windows2k/wmixwdm/
'lo anterior si quieres saber qué significa WMI
  Dim WMI As Object
  On Error Resume Next
  Set WMI = GetObject("winmgmts:")
  WMI_INSTALADO = (Err.Number = 0)
End Function

Private Sub Form_Load()
If WMI_INSTALADO() Then
  MsgBox "Su sistema posee WMI"
  getWMI_Info
Else
  MsgBox "Su sistema no posee WMI"
End If
End Sub

Private Sub getWMI_Info()
  Dim oAdapters As Object
  Dim oAdapter As Object
  Dim StrComputer As String
  StrComputer = "PCESTHER"
  ' Control Errores
  On Error GoTo Control_ERROR

   Set oAdapters = GetObject("winmgmts:" _
  & "{impersonationLevel=impersonate}!\\" & StrComputer & "\Windows").ExecQuery( _
    "SELECT * FROM Win32_ComputerSystem")
  ' Datos
  For Each oAdapter In oAdapters
    With oAdapter
     MsgBox "Usuario: " & .UserName
    End With
  Next
  On Error GoTo 0
  Exit Sub

Control_ERROR:
  MsgBox "Error: " & Err.Number & vbTab & Err.Description, vbCritical
  Resume Next
End Sub