Cannot enter password on ASUS laptop running Windows 10

I recently updated my Asus lap-top to Windows 10. Everything has been fine for a while.

Today, I tried to log-on, but found that although I can use either the finger mouse-pad or a USB mouse to move the cursor about (as usual) it is impossible to "click" on anything.

Hence I cannot select which user profile I want to log-in with: this isn't a problem as the one selected is the one I want to use. Crucially, I cannot "click on" the password box, so I cannot get it to "clear"/"highlight" so as to allow me to enter my password. Hence I cannot log on to the laptop to do anything at all.

How can I regain access to my lap-top?

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