1. For Vista, there is more resources requiered to play HD files. About 10 % more.
2. Try to avoid codec packs. At this time, the best decoder for x264 it's CoreAVC. Try to install and reduce post processing options until you don't have any more problems.
3. Do you have a small sample of a file with DDplus audio to test ? I am interested in such a file.
4. H264 files require much, much more CPU power than 720p or 1080i(MPEG2). Decoder also CoreAVC.
5. For MPEG2 HD files I use Elecard MPEG 2 decoder. And I am satisfied with the results.
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