Windows 8 was the first desktop operating system to introduce touch capability. The later editions of Windows 8.1 and Windows 10, after it also comes with touch plus some additional or extended features. For the touchscreen to work properly, you must have the latest touch hardware drivers installed. While there are also few other things which we need to care about.
In the latest Windows 10, the touch keyboard can be activated by right click over taskbar and selecting Show Touch Keyboard button option.
Using the touch keyboard button, the touch-keyboard can be accessed.
Consider a scenario, that you have a Windows 8 or later running touch supported the operating system. But when you use the touch keyboard to input something, either the buttons are not very large or not fit the screen.
For such trouble, you can try following steps to fix:
Touch keyboard not working in Windows
1. Press Windows Key + R combination, type put regedit in Run dialog box and hit Enter to open the Registry Editor.
2. Navigate here:
3. At this registry location and in the right pane of the above-shown window, look for the MonitorSize named registry string. Please note that this registry key is not available in non-touch based computers. The incorrect Value data for the MonitorSize registry string is the root cause behind this issue. Double click on the same string to modify it:
4. Finally, in the Edit String box, put a decimal data such as 22.5. Click OK. Close Registry Editor, reboot, and your problem should be fixed after restarting the machine.
Registry Disclaimer: These steps involve registry manipulation. Making mistakes while manipulating registry could affect your system adversely. So be careful while editing registry entries and create a System Restore point first.
Let us know if this works for you!