Have you made any changes to your computer's BIOS (when you first turn on your computer, and before Windows starts booting up you'd hit F1 or the Delete key to get in)? It's possible the touchpad was disabled there.
Do you have an external mouse plugged in at the same time? If so, try unplugging the mouse.
Finally, try looking in the control panel at Device Manager (is the device recognized properly or is there a question mark next to it?) or the Mouse settings.
Turning the TouchPad on and off
To switch the TouchPad on and off, quickly double-tap the TouchPad on/off button.
NOTE: If the TouchPad light is on (amber), the TouchPad is off.
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