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"No Audio Output Device Is Installed"

I need help! I'm having an audio problem with my computer. The audio was working fine and I don't remember installing anything from the internet or updating my windows vista.

I have a Toshiba Satellite Notebook
Model is: U300 PSU30C-NS608C
Windows Vista Home Premium
32-bit operating system

I've tried restarting my computer, still no change. I've tried installing the sound driver, again unsuccesful. I've tried going to control panel >> device manager and locating the sound device and hoping to disable and enable it, but can't find it anywhere!

Please helpppppp! I don't know what else to do.

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Comments
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Did you

Did you use System Restore to the day before the failure? That's what this feature is for!

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...

I have but my computer doesn't let me do it. I don't know why.

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That's bad.

Is Norton or other software that blocks system restore installed?

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.

I have Panda AVPro installed. Hmmm, do you think that's preventing it? I'll try disabling it.

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