vista codec ( half way ) pack

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Anyone getting sound problems with vista codec pack, i think i have 4.5 something and im still not getting sound on my dvd movies. i have a sound blaster audigy 7.1 card which is fully updated through the latest software updates that vista picks up. AVI movie files play with no problem but the dvd movies i have on disk provides no sound, in media player or media centre ..

any advice guys, on what i can use to get my fully function sound on my movies