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Keyboard and touchpad not working in windows 7

HP Recommended
ProBook 4540s
Microsoft Windows 7 (64-bit)


I was working on my laptop and then the power came off and the laptop shutdown because i work without a battery. After the came power on again the keyboard and the touchpad of the laptop are disabled in windows 7 but they work on startup and bios. I have tried making changes in bios but with no luck and i tried an external keyboard and mouse but didnt work too. So how I solve this ?


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