How can I disable laptop keyboard

I have a dell 1150.  Several keys are sticking on which makes it impossible to use.  I have tried to un-install  the drivers, in systems, hardware, divice mgr, to disable the keyboard but that didn't work.  I do not know any other place to go to disable.  I have connected a USB keyboard and it is working but the sticking keys are interfering with it.  I just need to disable the laptop keyboard.  Any suggestions?  Thanks Muz