When I'm playing/working on my laptop the keyboard sometimes key-in randomly, so I ask:
How can I disable its on-board keyboard?
Laptop Acer v3 772g
OS: Windows 8
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Open control panel > device manager > keyboard (assuming you are using an external USB keyboard) and remove the built in one.
Now that is HOW:
So now WHY?
Key in randomly means you press a key and random keys are displayed, you have these options;
Have a dirty keyboard. Clean it. OR
Are pressing way to hard.
If you are just using the mouse and random characters are displayed, (not likely the issue) but usually this would indicate a faulty mouse or corrupted driver. I only mention this because although unlikely, it could happen.