After upgrading to vista x64 I don't have any sound! I any one has possible answers...I've been told it's best to buy a vista ready sound card...but I don't really want to spend money on a card when I already have onboard sound...
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Have you installed the driver for your motherboard? You should reinstall all your driver: chipset (should be the first to install), and then the other (sound, network, etc).
If you can not find on the bundle CD, go to the manufacturer's website.