Problem with sound buttons on keyboard since upgrading

Since my upgrade to Mavericks the sound buttons on my keyboard F10,11,12  no longer work. When I press the buttons to either increase or decrease sound, the page I am on disappears from the screen and the mute button diminishes the page but there is no change to the sound.  Any suggestions?

Thanks for your reply.  I tried your suggestion but I came across this sentence:
OS X does not store network settings in NVRAM / PRAM. If you are troubleshooting a network issue, resetting it will not help. 
I am not very technical, I did try some options but I am afraid I couldn't get it to work. :-(

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