You've probably installed/uninstalled something that messed up your MPEG-2 codecs. The easiest way to fix this is to simply pay for the Plus upgrade from TiVo. That includes an MPEG-2 codec that is explicitly used for all TiVo files, so it will never be undone by the installation of another program.
If you don't want to pay then you'll have to dig into GraphEdit and figure out what's going on. It could be that you have a codec which is being selected but can't actually handle the TiVo files, or it could be that you simply don't have a codec at all. If it's the former then you need to use a DirectShow filter manager program to lower the merit of the problem codec and allow another one to step in instead. If it's the later then you'll need to install a program that includes an MPEG-2 codec such as a DVD player package or video editor. (although if you're going to have to pay anyway you may want to reconsider TiVo Desktop Plus)
Dan
If you don't want to pay then you'll have to dig into GraphEdit and figure out what's going on. It could be that you have a codec which is being selected but can't actually handle the TiVo files, or it could be that you simply don't have a codec at all. If it's the former then you need to use a DirectShow filter manager program to lower the merit of the problem codec and allow another one to step in instead. If it's the later then you'll need to install a program that includes an MPEG-2 codec such as a DVD player package or video editor. (although if you're going to have to pay anyway you may want to reconsider TiVo Desktop Plus)
Dan
