How to Permanently Disable The Touch Keyboard In Windows 8 and 10
In the Services menu that pops up, click on the “Name” column to sort the services by name, and then scroll until you locate the “Touch Keyboard and Handwriting Panel Service”. Double click on the entry.
In the resulting properties menu, look for “Startup type” and, in the drop down menu, change it to “Disabled”. At the bottom of the window, under “Service status”, click “Stop” to halt the service.
Click “OK” and then, upon rebooting your computer next, the change should be permanent. No more annoying icon in the system tray.