I have had keyboards not work after an update before and was able to fix it, but this time nothing I have tried has worked. I have tried different keyboards, uninstalled and reinstalled drivers, and tried to update drivers but to no avail. I am currently writing this using the on-screen keyboard. I can also tell that this is a windows issue because my keyboard lights up the keys I press, but does not turn on the caps lock light once it is pressed. If it is any help, I am using a Razer Blackwidow v3. I have tried enabling and disabling demo mode on my keyboard, but that does nothing.