Ubuntu has No Sound

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http://askubuntu.com – i am using ubuntu via wubi. i don't hear a single noise or sound, no matter i am playing a song or video. how should i fix it? thz I have already installed the Ubuntu Restricted Extras and Flash, as well as all available updates, but it still doesn't give me a single sound, what should i do? is there any sound drive i have to install just like win7? I am using an Acer notebook with win7. (HowTos)