ABILITAR BARRA DE TAREFAS

'-----------------------------------Em um modulo
Public Declare Function FindWindow& Lib "user32" Alias "FindWindowA" (ByVal lpClassName$, ByVal lpWindowName$)
Public Declare Function EnumChildWindows Lib "user32" _
(ByVal hWndParent As Long, ByVal lpEnumFunc As Long, _
ByVal lParam As Long) As Long

Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _
(ByVal hWnd As Long, ByVal lpClassName As String, _
ByVal nMaxCount As Long) As Long

Public Declare Function EnableWindow Lib "user32" _
(ByVal hWnd As Long, ByVal fEnable As Long) As Long

Public StartButtonhWnd As Long


Public Function EnumChildProc(ByVal lhWnd As Long, ByVal lParam As Long) _
As Long
Dim RetVal As Long
Dim WinClassBuf As String * 255
Dim WinClass As String

RetVal = GetClassName(lhWnd, WinClassBuf, 255)
WinClass = StripNulls(WinClassBuf) ' remove extra Nulls & spaces
If WinClass = "Button" Then
StartButtonhWnd = lhWnd
RetVal = EnableWindow(StartButtonhWnd, False)
EnumChildProc = False ' Stop looking
Else
EnumChildProc = True ' Keep looking
End If
End Function

Public Function StripNulls(OriginalStr As String) As String 
If (InStr(OriginalStr, Chr(0)) > 0) Then
OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1)
End If
StripNulls = OriginalStr
End Function

'-----------------------------------No Botão Desabilitar
Dim WinClass As String
Dim TaskBarHwnd As Long, lRet As Long, lParam As Long
'
WinClass = "Shell_TrayWnd"
'
TaskBarHwnd = FindWindow(WinClass, vbNullString)
'
lRet = EnumChildWindows(TaskBarHwnd, AddressOf EnumChildProc, lParam)

'-----------------------------------No Botão Habilitar
Dim RetVal As Long
If StartButtonhWnd <> 0 Then
RetVal = EnableWindow(StartButtonhWnd, True)
End If