I've been using Windows 7 happily until I played a DVD movie and heard continuous jittery noise. The picture was fine, but Windows Media Player 12 only uttered the jittery noise instead of words and music.
I think it's a codec problem. To fix the problem, I downloaded Preferred Filter Tweaker for Windows 7 and disabled Microsoft DTV-DVD Audio Decoder.
This renames C:\Windows\System32\msmpeg2adec.dll so that Windows Media Player 12 doesn't use its own codec. Then, I installed AC3Filter. This fixed the jittery noise problem. Alternatively, ffdshow can be used instead of AC3Filter.
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