If the touchpad still doesn't installed or work:

Reinstall Chipset and touchpad drivers in correct order or one by one. 

How to reinstall drivers in the correct order | Dell US

:emotion-2:

If you haven't done so yet, I'd suggest updating the System Setup(BIOS). Please click on link below to safety install latest BIOS version.

Update System Setup (BIOS) for a Dell Computer (Official ...

Hi,

I resolved the problem with installing Intel I/O but not founded in Win 10, but Win 8.1.

Thenks.

Glad to know the touchpad is working again. Thanks for sharing your findings for others to see with same problem.