There are/were several other reports of playback problems, which I suspect are all related.Well, I am all out of ideas. It seems that you are the only person having this problem, unless you can find more. At least I don't see anyone else reporting the same.
I guess you could contact the relevant people to ask if they are still having the same problems. I was one of these, and I fixed it as described above.
Out of interest, why do you absolutely NEED to stick with XP? You will get a much better experience with Windows 7.