Plug in an external keyboard, do they work now? If no, try the steps below. Go to Control Panel then look for Ease of Access - Click on Change how your keyboard works. - Uncheck where it says Turn on Sticky Keys and click OK. If this doesn't work try checking the keyboard language if set correctly. - Go back to Control Panel then look for Region and Language and make sure all tabs at set to the United States. - Click Apply when a change is made then try your keyboard again. If these tricks don't work, you will need to replace the keyboard.