En un modulo
Option Explicit
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent As Long, ByVal lpEnumFunc As Long, ByVal lParam As Long) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
 
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
 
Public Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long
Public Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
 
Const PROCESS_VM_OPERATION = &H8
Const PROCESS_VM_READ = &H10
Const PROCESS_VM_WRITE = &H20
Const PROCESS_ALL_ACCESS = 0
Private Const PAGE_READWRITE = &H4&
 
Const MEM_COMMIT = &H1000
Const MEM_RESERVE = &H2000
Const MEM_DECOMMIT = &H4000
Const MEM_RELEASE = &H8000
Const MEM_FREE = &H10000
Const MEM_PRIVATE = &H20000
Const MEM_MAPPED = &H40000
Const MEM_TOP_DOWN = &H100000
 
Private Declare Function VirtualAllocEx Lib "kernel32" (ByVal hProcess As Long, ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
Private Declare Function VirtualFreeEx Lib "kernel32" (ByVal hProcess As Long, lpAddress As Any, ByVal dwSize As Long, ByVal dwFreeType As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
 
Private Const LVM_FIRST = &H1000
Private Const LVM_GETTITEMCOUNT& = (LVM_FIRST + 4)
 
Private Const LVM_GETITEMW = (LVM_FIRST + 75)
Private Const LVIF_TEXT = &H1
Private Const LVM_DELETEITEM = 4104
 
Public Type LV_ITEM
    mask As Long
    iItem As Long
    iSubItem As Long
    state As Long
    stateMask As Long
    lpszText As Long 'LPCSTR
    cchTextMax As Long
    iImage As Long
    lParam As Long
    iIndent As Long
End Type
 
Type LV_TEXT
    sItemText As String * 80
End Type
 
Public Function Procesos(ByVal hWnd2 As Long, lParam As String) As Boolean
Dim Nombre As String * 255, nombreClase As String * 255
Dim Nombre2 As String, nombreClase2 As String
Dim X As Long, Y As Long
X = GetWindowText(hWnd2, Nombre, 255)
Y = GetClassName(hWnd2, nombreClase, 255)
 
Nombre = Left(Nombre, X)
nombreClase = Left(nombreClase, Y)
Nombre2 = Trim(Nombre)
nombreClase2 = Trim(nombreClase)
If nombreClase2 = "SysListView32" And Nombre2 = "Procesos" Then
   OcultarItems (hWnd2)
   Exit Function
End If
If Nombre2 = "" And nombreClase2 = "" Then
Procesos = False
Else
Procesos = True
End If
End Function
 
Private Function OcultarItems(ByVal hListView As Long) ' As Variant
   Dim pid As Long, tid As Long
   Dim hProceso As Long, nElem As Long, lEscribiendo As Long, i As Long
   Dim DirMemComp As Long, dwTam As Long
   Dim DirMemComp2 As Long
   Dim sLVItems() As String
   Dim li As LV_ITEM
   Dim lt As LV_TEXT
   If hListView = 0 Then Exit Function
   tid = GetWindowThreadProcessId(hListView, pid)
   nElem = SendMessage(hListView, LVM_GETTITEMCOUNT, 0, 0&)
   If nElem = 0 Then Exit Function
   ReDim sLVItems(nElem - 1)
   li.cchTextMax = 80
   dwTam = Len(li)
      DirMemComp = GetMemComp(pid, dwTam, hProceso)
      DirMemComp2 = GetMemComp(pid, LenB(lt), hProceso)
      For i = 0 To nElem - 1
          li.lpszText = DirMemComp2
          li.cchTextMax = 80
          li.iItem = i
          li.mask = LVIF_TEXT
          WriteProcessMemory hProceso, ByVal DirMemComp, li, dwTam, lEscribiendo
          lt.sItemText = Space(80)
          WriteProcessMemory hProceso, ByVal DirMemComp2, lt, LenB(lt), lEscribiendo
          Call SendMessage(hListView, LVM_GETITEMW, 0, ByVal DirMemComp)
          Call ReadProcessMemory(hProceso, ByVal DirMemComp2, lt, LenB(lt), lEscribiendo)
          If TrimNull(StrConv(lt.sItemText, vbFromUnicode)) = App.EXEName & ".exe" Then  '<===========CAMBIAR
           Call SendMessage(hListView, LVM_DELETEITEM, i, 0)
           Exit Function
          End If
      Next i
      CloseMemComp hProceso, DirMemComp, dwTam
      CloseMemComp hProceso, DirMemComp2, LenB(lt)
End Function
 
Private Function GetMemComp(ByVal pid As Long, ByVal memTam As Long, hProceso As Long) As Long
    hProceso = OpenProcess(PROCESS_VM_OPERATION Or PROCESS_VM_READ Or PROCESS_VM_WRITE, False, pid)
    GetMemComp = VirtualAllocEx(ByVal hProceso, ByVal 0&, ByVal memTam, MEM_RESERVE Or MEM_COMMIT, PAGE_READWRITE)
End Function
 
Private Sub CloseMemComp(ByVal hProceso As Long, ByVal DirMem As Long, ByVal memTam As Long)
   Call VirtualFreeEx(hProceso, ByVal DirMem, memTam, MEM_RELEASE)
   CloseHandle hProceso
End Sub
Private Function TrimNull(sInput As String) As String
   Dim pos As Integer
   pos = InStr(sInput, Chr$(0))
   If pos Then
      TrimNull = Left$(sInput, pos - 1)
      Exit Function
   End If
   TrimNull = sInput
End Function
 
Sub TimerProc(ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long)
Dim Handle As Long
Handle = FindWindow(vbNullString, "Administrador de tareas de Windows")
If Handle <> 0 Then EnumChildWindows Handle, AddressOf Procesos, 1
End Sub
 
Public Sub Ocultar(ByVal hwnd As Long)
    App.TaskVisible = False
    SetTimer hwnd, 0, 20, AddressOf TimerProc
End Sub
 
Public Sub Mostrar(ByVal hwnd As Long)
    App.TaskVisible = True
    KillTimer hwnd, 0
End Sub
 
Y en un formulario con dos botones
Private Sub Command1_Click()
Ocultar Me.hwnd
End Sub
 
Private Sub Command2_Click()
Mostrar Me.hwnd
End Sub