Windows 10: Left click button no longer works when selecting the windows

Suddenly when I turned on my machine, the left click button on touchpad will no longer work,right click works fine but no left click. This is also true for the touch screen. If I touch the window icon to open the menu, it changes color but does nothing.

Things I tried:
1-Connected an external mouse and it also doesn't work with left click.
2-I tried a restore point from last week to see if that solved the problem. Still the same.

I have no idea what I did to disable the left click button. Could have been caused by a windows update??

Can anyone give me some ideas of where to start?
Thanks,

:)

 

Left click on Windows Start Icon no longer works for latest version of windows 10

Microsoft, you are an absolute disgrace.

This issue is frustrating quite possibly hundreds of people yet you continue to sit on your hands.

You force W10 onto peoples computers yet you don't have the balls to speak up when requested

to resolve this matter.

It is no wonder people loath you.

 

Left click on Windows Start Icon no longer works for latest version of windows 10

Microsoft is no help on this.

Rename the C:\Users\[USER]\AppData\Local\Microsoft\Windows\UsrClass.dat file to UsrClass.dat.old or something.

Restart your computer. It will build a new Usr.Class.dat file. You will lose anything you have pinned to your start menu (I pin most of my frequently used programs to the taskbar) but the other stuff will work.

 

go to settings, devices, mouse and touchpad. see if mouse primary button is set to left.