Trying to open and view an MPEG-2. Used to have no problem on my old computer with XP. Now have Vista. Won't open. I tried to open it with Real Player; got a window that advised I need to get a Microsoft DirectShow MPEG-2 Decoding Software. Googled and it took me all over the place. Anyone have advice on how to resolve this? Any free mpeg-2 decoders? I thought these came with Vista????