no audio in vlan mode in some channels

[Maudit]

xp sp3
skystar2
driver 4.4.3

with some channels that i usually watch, i got a problem with lan streaming..
some channels like mediaset bouquet or vh1 classic for example i cant ear any sound in the client computer. why? and why not all channels but just any?

thanks

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[Maudit]

i still have the same problem, can't ear sounds.
not with all channels, but just any.
can someone help me?