Hi sweetpea.
You could try removing the keyboard from the device manager and let Windows reinstall it when you restart.
Click Start > Control Panel > System > Hardware tab > Device Manager.
Click the cross beside 'Keyboards'
Right-click on your keyboard description and select 'uninstall' from the menu. Then OK.
You'll then need to restart and let Windows boot up again.
EDIT: Might seem a basic question but are you sure the keyboard is properly plugged in?
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