Restart the laptop. When it starts it will/should display, briefly, something like "Press DEL to enter setup". It might say F10 instead of DEL, or possibly something else. When that appears hammer on the DEL (or whatever it says) key on the laptop keyboard. If it goes into the setup screen (usually a blue screen with text menus) then the keyboard is working, and the problem is in Windoze. If it doesn't then either you weren't quick enough hammering on the keyboard (switch off then on then try again), or the keyboard is broke.
Assuming the DEL thing worked, switch the laptop off for a few seconds, unplug any USB keyboard then turn on again and let it start normally this time. Using a mouse click on the Windows START button then choose Control Panel. When that opens double-click on the System icon, then when that opens click on the Hardware tab and then the "Device Manager" button. This will give you a list of the hardware in your laptop or connected to it. Halfway down the list is "Keyboards" with a "+" sign to the left. Click on the + and it will show what keyboard(s) you have connected. If there's nothing there then Windows hasn't seen your keyboard. If there is one then make sure it's not disabled (right-click on it then choose "Enable" from the popup menu). I doubt it is this (on my laptop it's not even possible to disable the keyboard) but it's worth checking.
Dave
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