I'm not able hook to Internet Explorer with SetWindowsHookEx

Hi,I have the following code (and it doesn't work):

            nWinHandle1 = FindWindowEx(nWinHandle1, IntPtr.Zero, "Internet Explorer_Server", null);
            ProcessId = GetWindowThreadProcessId(hwnd, out ProcessId);
            hHook = SetWindowsHookEx(4, MouseHookProcedure, (IntPtr)0, ProcessId);

Marshal.GetLastWin32Error() returns 1008 (DEC).

Can U help me?

Regards

bp

Bartosz