Touchpad doesn't work in Windows 10 1903

I don't know why it's not working on the new version of Windows but i know the cause of that problem.

The Windows Precision drivers for the touchpad isn't optimal for the new Windows update.

To fix it, you have to :

1) Open Settings

2) Click on Apps

3) Look for the program Synaptics drivers or something like that and uninstall it.

4) And to be sure, click Windows key + X and click on M on your keyboard

5) Expand the tab Mice and other pointing devices

6) Right-click on Synaptics PS/2 Port Touchpad

7) Click Uninstall Driver

8) Restart your computer.

These steps helped me a lot, hope it helped you too ;)

Hello,

If you're on Lenovo Ideapad 320, Lenovo has provided a firmware update for the laptop which came a few weeks after the release of Windows 10 1903. Update to the latest firmware and issue should be resolved.

Those on different devices, should update the touchpad drivers to latest version.

If issue still persists, create a System Restore point first.

Then uninstall Synaptics from Settings > Apps > App & features.

Open Device Manager and under Mice and other pointing devices, right click on Synaptics PS/2 Port Touchpad, select Uninstall. 

Reboot and check if the issue is resolved.

Hope this helps!