My laptop goes haywire when the sound is unmuted

My laptop is going berzerk anytime I unmute the sound on it. When the sound is muted everything works fine, however when I unmute it the laptop will paste zxc\ty,.\ in the nearest free space, the caps lock will turn on, touchpad locks up, the scroll bar on the left will be stuck scrolling down and will nothing will work/stop until I hit the spacebar three times. Then I can once again use the keyboard but the zxc\ty,. keys will not work as well as the enter key on the main keyboard and the num lock on the keypad. When I try to mute it again, the mute button will not work and I will have to mute it using the touch pad by clicking on the speaker icon and selecting mute. Once it is muted again, everything will go back to functioning normally but without sound of course. Any ideas what could be causing this or how to fix it?

I am having the exact same issue with my HP Probook 440G1 with windows 8.1 Enteprise . Please help ASAP

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My laptop goes haywire when the sound is unmuted

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