My laptop arrow keys and Fn keys are not working.Windows 8 lenovo?

My laptop arrow keys and Fn keys are not working.Windows 8 lenovo? - 1

Kollam

Type dev in search to open Device Manager
Click the little arrow by Keyboards
double click "Standard PS/2"
Driver Tab
Uninstall
restart laptop

Spytech

Unplug power supply, remove battery.Hold and press power button for 20sec, it resets CPU.

Boris 24

But by unistalling won't the keyboard software bee deleted?

Guest