The weekly Windows 8.1 push updates disable my laptop keyboard. (It's a Toshiba Satellite.) To get the keyboard working again, I have to restore to a time before the update. How can I prevent this from happening? Thank you.

Can you update the device drivers and check ? Also, are there any specific updates ? 

I don't know how to update the device drivers.  All I know is how to restore.  (I'm too old to be technologically astute.) 

Each of the last two updates has made this happen.

This links gives detailed info : http://www.pcworld.com/article/2017357/why-how-and-where-to-update-your-windows-8-drivers.html

OK, I'll try, thank you

Sorry to be so ignorant.  Which drivers do I update?  Thank you.

The keyboard driver in Device Manager:

Any updates?