How can I disable my laptop’s keyboard and touchpad?

10 Sep 2012
Windows 8
Chrome 22
10 Sep 2012 | Windows 8 | Chrome 22

I got a HP Pavillion dv2700 PC from my friend with a not-so-functional keyboard and touchpad (some keys work while other do not, and the touchpad is really not responsive). I intend to use itas my secondary laptop so I got an external keyboard and mouse. The problem is to save space, I put the external keyboard on top of the laptop keyboard, and as such sometimes the keys from the laptop keyboard and the touchpad are activated. It is really irritating. I want to know whether I could disable the laptop keyboard and touchpad entirely and just use the external ones? Thanks a lot!