Can you please confirm if it is a touchpad or keypad of your laptop that is faulty?
If it is the touchpad, in Packard Bell laptops you can enable or disable it by pressing the F6 key with or without the Fn key depending on the type of Fn configuration in your laptop. (Since you have already tested it with the Fn key, you should test it without Fn this time.)
Alternatively you can go to Control Panel > Hardware and Sound and click the Mouse link from under the Devices and Printers category, and from the displayed interface, re-enable the touchpad.
On the other hand, if it is the keypad (keyboard) that is not working, you can try uninstalling the keyboard driver from the Device Manager snap-in and then restarting the laptop, thus allowing Windows to reinstall the driver automatically.
Feel free to revert if further assistance is needed. Good Luck!!