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So the Inspiron 5391 has been a good laptop for my son but due to Windows update not working, a fresh install of Windows 10 was done and running good now. Except for the fact that the Touchpad does not work at all. It is not visible in the device list, it is not visible in setup of Windows for Touchpad - that only shows sensitivity but nothing else. Any hints or suggestions on which program or updates to use to get drivers installed for this? Windows 10 is up to date and all the DELL drivers have been installed and reinstalled. It was working earlier today before the Windows reinstallation 
Touchpad not working - Inspiron 5391