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uses Psapi, tlhelp32;

const
  RsSystemIdleProcess = 'System Idle Process';
  RsSystemProcess = 'System Process';

function IsWinXP: Boolean;
begin
  Result := (Win32Platform = VER_PLATFORM_WIN32_NT) and
    (Win32MajorVersion = 5) and (Win32MinorVersion = 1);
end;

function IsWin2k: Boolean;
begin
  Result := (Win32MajorVersion >= 5) and
    (Win32Platform = VER_PLATFORM_WIN32_NT);
end;

function IsWinNT4: Boolean;
begin
  Result := Win32Platform = VER_PLATFORM_WIN32_NT;
  Result := Result and (Win32MajorVersion = 4);
end;

function IsWin3X: Boolean;
begin
  Result := Win32Platform = VER_PLATFORM_WIN32_NT;
  Result := Result and (Win32MajorVersion = 3) and
    ((Win32MinorVersion = 1) or (Win32MinorVersion = 5) or
    (Win32MinorVersion = 51));
end;

function RunningProcessesList(const List: TStrings; FullPath: Boolean): Boolean;
  
function ProcessFileName(PID: DWORD): string;
  var
    Handle: THandle;
  begin
    Result := '';
    Handle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, PID);
    if Handle <> 0 then
      try
        SetLength(Result, MAX_PATH);
        if FullPath then
        begin
          if GetModuleFileNameEx(Handle, 0, PChar(Result), MAX_PATH) > 0 then
            SetLength(Result, StrLen(PChar(Result)))
          else
            Result := '';
        end
        else
        begin
          if GetModuleBaseNameA(Handle, 0, PChar(Result), MAX_PATH) > 0 then
            SetLength(Result, StrLen(PChar(Result)))
          else
            Result := '';
        end;
      finally
        CloseHandle(Handle);
      end;
  end;
  
function BuildListTH: Boolean;
  var
    SnapProcHandle: THandle;
    ProcEntry: TProcessEntry32;
    NextProc: Boolean;
    FileName: string;
  begin
    SnapProcHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    Result := (SnapProcHandle <> INVALID_HANDLE_VALUE);
    if Result then
      try
        ProcEntry.dwSize := SizeOf(ProcEntry);
        NextProc := Process32First(SnapProcHandle, ProcEntry);
        while NextProc do
        begin
          if ProcEntry.th32ProcessID = 0 then
          begin
            FileName := RsSystemIdleProcess;
          end
          else
          begin
            if IsWin2k or IsWinXP then
            begin
              FileName := ProcessFileName(ProcEntry.th32ProcessID);
              if FileName = '' then
                FileName := ProcEntry.szExeFile;
            end
            else
            begin
              FileName := ProcEntry.szExeFile;
              if not FullPath then
                FileName := ExtractFileName(FileName);
            end;
          end;
          List.AddObject(FileName, Pointer(ProcEntry.th32ProcessID));
          NextProc := Process32Next(SnapProcHandle, ProcEntry);
        end;
      finally
        CloseHandle(SnapProcHandle);
      end;
  end;
  
function BuildListPS: Boolean;
  var
    PIDs: array [0..1024] of DWORD;
    Needed: DWORD;
    I: Integer;
    FileName: string;
  begin
    Result := EnumProcesses(@PIDs, SizeOf(PIDs), Needed);
    if Result then
    begin
      for I := 0 to (Needed div SizeOf(DWORD)) - 1 do
      begin
        case PIDs[I] of
          0:
            FileName := RsSystemIdleProcess;
          2:
            if IsWinNT4 then
              FileName := RsSystemProcess
            else
              FileName := ProcessFileName(PIDs[I]);
            8:
            if IsWin2k or IsWinXP then
              FileName := RsSystemProcess
            else
              FileName := ProcessFileName(PIDs[I]);
            else
              FileName := ProcessFileName(PIDs[I]);
        end;
        if FileName <> '' then
          List.AddObject(FileName, Pointer(PIDs[I]));
      end;
    end;
  end;
begin
  if IsWin3X or IsWinNT4 then
    Result := BuildListPS
  else
    Result := BuildListTH;
end;



function HandleIsExplorer(HandleHWND: hwnd): string;
var
  List: TStringList;
  PID: DWORD;
  I: Integer;
begin
  Result := '';
  if IsWindow(HandleHWND) then
  begin
    PID := INVALID_HANDLE_VALUE;
    GetWindowThreadProcessId(HandleHWND, @PID);
    List := TStringList.Create;
    try
      if RunningProcessesList(List, True) then
      begin
        I := List.IndexOfObject(Pointer(PID));
        if I > -1 then
        begin
          Result := lowercase(extractfilename(List[I]));
          
        end;
      end;
    finally
      List.Free;
    end;
  end;

end;

function HideAndShowVistaTaskbarStartButton(wHandle: HWND; hide: Bool): Bool; stdcall; export;
var
  Title, ClassName: array[0..255] of char;
begin
  Result := True;
  GetWindowText(wHandle, Title, 255);
  GetClassName(wHandle, ClassName, 255);



  if string(Title) + '-' + string(ClassName)='Start-Button' then
  begin
   if HandleIsExplorer(wHandle)='explorer.exe' then
   begin



  if hide= True then
  begin
   if IsWindowVisible(wHandle)=true then
   begin
   //Hide if not allready hidden
   ShowWindow(wHandle,SW_HIDE);
   end;
  end else
  begin
  if IsWindowVisible(wHandle)=false then
   begin
   //Show if not allready shown
   ShowWindow(wHandle,SW_SHOW);
   end;
  end;
   end;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
EnumWindows(@HideAndShowVistaTaskbarStartButton,Integer(true));//Hide
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
EnumWindows(@HideAndShowVistaTaskbarStartButton,Integer(false));//Show
end;