laptop keyboard stopped working after update

After installing automatic updates on my TOSHIBA laptop with Windows 8.1 the keyboard no longer works.
Upon examining the details the updates were installed a day or two before but the issue started only after a reboot.

The following devices are indicated as not working in device manager:


1) HID keyboard device
2) Standard PS/2 keyboard:

"Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)"

3) Elan input device:

"This device cannot start. (Code 10)"

There is nothing wrong with the keyboard itself. This computer has a dual boot with a Windows 7 partition. The keyboard works normally in Windows 7.


These are the things I have tried (using the on screen keyboard);

Uninstalling the Elan software update that seemed to trigger the issue.

Uninstalling the items in question from device manager and rebooting.

Uninstalling the items from device manager and scanning for hardware changes.

Installing OS appropriate drivers from TOSHIBA website

Reinstalling the Elan software update.

Running devices troubleshooting software from Microsoft.


I have been unable to find any useful advice online.

I would very much appreciate any advice or suggestions.


The specifications for the laptop are as follows:

toshiba c655d-s5300
64 bit
dual boot with Windows 8.1 Pro

AMD E-300 APU 1.3ghz
8gb RAM