Did you use tools like driver booster or similar?
update the BIOS
try installing the touch pad driver (win 8)
if this doesn´t work, get into the device manager of windows and right click on the keyboard (input device or similar), then click left on update driver while connected to the internet
If you get into the BIOS, does this issue happen there too?
Is the caps lock LED getting on or off?
If yes, maybe the keyboard is not correctly connected to the motherboard. Check the ribbon cable of the keyboard inside the laptop, reconnect it tightly.
If this doesn´t help, the keyboard might be faulty.