I know it's a frequently asked question, but I don't manage to find a solution.
I have a new Asus laptop (Asus S551LB-CJ003H) on Windows 8.1, and a Logitech Mouse M125. The problem is : when I type on my keyboard, the mouse left click is disabled. And, worse, it still lasts one second after the end of typing.
I have tried to go to Mouse and Keyboard properties in the Control panel, but I didn't find the option to disable this behavior. My mouse driver is up to date. And I haven't the possibility to downgrade it.
Finally, the problem also occurs for my touchpad. (but this is less annoying)