keyboard loudspeaker mute on/off button not working.

i have a toshiba satellite l350 laptop running vista.at the top of the keyboard are the dvd control pushbuttons play/stop/fast forward etc.the mute on/off button is part of this switch layout & has stopped working.any ideas how to resolve would be appreciated.
09:58 Tue 24th Apr 2012
 
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Find the hotkey drivers here

http://uk.computers.t...s_bios.jsp?service=UK

And install them
Question Author
many thanks.downloade hotkey files but no luck.error message incompatable with my laptop.
Are you sure you downloaded the Vista version?
Question Author
yes indeed.the only query i can't resolve is whether my laptop runs 32 or 64 bit vista.i tried both to no avail.i downloaded both hotkey files listed no luck though.
regards,john

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