Sony PCV-RZ49G - Manual (Page 392)

DVD audio options are unavailable
If you are unable to adjust your DVD audio settings, you might not have a decoder installed or your decoder might need to be updated.
In addition to your DVD-ROM drive and DVD player software, you must have either a hardware decoder or a software decoder in order
to play DVDs. A hardware decoder also requires a decoder driver; hardware decoders and their drivers are available from third-party
manufacturers.
If you have an older decoder installed, contact the manufacturer of the decoder to obtain an updated version that is compatible with
Windows XP Media C enter Edition.
For more information about DVD decoders, see Help and Support C enter.
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