I used to have this issue, caused by installing an MPEG2 codec that couldn't do CSS (Elecard MPEG2 Decoder). Uninstalling this allowed me to play DVDs in WMP because it then used the PowerDVD decoder instead of the non-CSS one.
I've used ZoomPlayer (Pro) to screencap DVDs so I know that works. In ZoomPlayer you can check to see what filter is being used by default too.
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