Can't type into Cortana and Search in Windows 10

I found that the keyboard did not work for any Windows 10 Modern Apps, just for the traditional desktop apps. 

As a temporary solution you can run ctfmon.exe from Command Prompt (Admin) but it works only till the next reboot.

For a more permanent fix:

1. Open Task Scheduler
2. Go to Microsoft > Windows > TextServicesFramework
3. On MsCtfMonitor, do a right-click and enable the task
4. Restart your machine

That's it. All the search boxes and other entry boxes should work again.

If the task MsCtfMonitor is missing from the list of tasks, you can import it with the .XML file.