First I would uninstall Desktop and run the 'cleaner' utility at www.tivo.com/assets/exe/tivotogo/TiVoDesktopCleaner.zip to remove all traces of the previous installation. Then reinstall Desktop from scratch. You will have to enter your Media Access Key after running the cleaner. Sorry about the help file - I don't use Vista very often even though I bought a copy of Ultimate. If you follow the generic message it will lead you to a patch from Microsoft that will install the older help file reader. TDCM doesn't actually provide any codecs, it just helps you pick the right ones from the codecs actually installed on your PC. Usually your DVD player software installs the necessary codecs. Vista Ultimate and Home Premium have MPEG-2 support built in. In general all you have to do is use the utility to open a .TiVo file and test the playback. The graph will show you the current DirectShow filters in use, and you can experiment with other options by clicking the Settings button. Sorry for the slow reply, and let me know if you have any other questions.