Zero key doesn't work or produces //..:: or adjusts volume

I have a MacBook Air which is just over 6 months old and the zero key has stopped working properly. I have not spilt anythingon the keyboard and it is not damaged. I also plug the machine into an Apple screen and use an external keyboard which mimmicls the exact same problem. Whe I pres the zero key it either doesnt owrk at all, adjusts the volume up and down or produces symbls such as /: etc. Any ides? Driving me crazy.

Satellite C855D-S5320
Downloads here.
Have you upgraded to Windows 8.1? If so, did you do it this way?
   How to Update from Windows 8 to Windows 8.1
I don't understand your situation. Can you boot to Windows? If so, you can restore the hard disk to its original out-of-the-box contents this way in Windows 8.
   Settings > Change PC settings > General tab > Remove everything and reinstall Windows
And this way in Windows 8.1.
   Settings > Change PC settings > Update and recovery tab > Recovery tab > Remove everything and reinstall Windows
I don't see anything about a zero key in your User's Guide.
   Satellite/Satellite Pro C800/L800/S800 Series User’s Guide
-Jerry

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Zero key doesn't work or produces //..:: or adjusts volume

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