How to disable the laptop keyboard?

My Laptop Keyboard is crap. All the buttons are broken but the spacebar. They've been broken since my little brother's poured chocolate milk into my laptop almost 2 years ago. I got a new keyboard that goes on my Acer Laptop Keyboard, but it puts pressure on the spacebar which makes all my words move like th i s. It's irritating. How do I disable the laptop keyboard, if I can? How about Acer Laptop Keyboard?