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I have a Toshiba laptop with Windows Vista. I turned on my computer once and it had a little red 'X' on the volume speaker. I reinstalled the driver (I'm not sure if I did that right though), and now the sound works, but I can't adjust the volume with the Fn and / keys, or Mute.

Is there a way to fix this?

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I had a similar problem with my Pavilion (Vista) and the problem was an incompatibility issue between HP's drivers and a Vista update. I was unable to overcome it till Microsoft released a patch for this. – Mehper C. Palavuzlar Mar 12 '10 at 8:11
I have the same problem with Windows 7 + Cooler Silent Fn function – kokbira May 20 '11 at 13:31

The Fn key functionality will depend on driver and/or software from the manufacturer. Check the driver/downloads site for your model, and one of them should restore this, assuming it exists for Vista.

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