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What is the brand/model of your computer please?
This sounds like you will need to replace the keyboard.
okay, try this please>
yes, reply here when finished. Make sure and choose a restore point to when the keyboard was working.
select Choose a different restore point
this sounds like your usb keyboard is not installed.
okay, what is the brand/model of the usb keyboard. Do you have the same symptoms with the built in keyboard?
Have you tried Microsoft FixIt?
okay, go to device manager, then find the keyboard in the list, then right click on the keyboard and choose uninstall, then reboot the computer.
try this first please, unplug that keyboard and then try this please> remove the power cord, then the laptop battery, then press and hold the power button for 60 seconds, then reinsert the battery and power on then check the built in keyboard function.
yes, you can come back to this screen anytime.
Holding the power button with no power connected drains residual power that may be causing a glitch with the hardware settings.
Yes, leave it unplugged while you press the power button for 60 seconds please.