Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Public Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long

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

Public Sub EnableStartButton(Optional Enabled As Boolean = True)
Dim lHwnd As Long 'declare variables
lHwnd& = FindWindowEx(FindWindow("Shell_TrayWnd", ""), 0&, "Button", vbNullString)
Call EnableWindow(lHwnd&, CLng(Enabled))
End Sub