Special Functions keys not working on Satellite C50 - Windows 8.1

Hello,
Please could someone help me out.
I have a Toshiba Satellite C50-A0393 that I got a few months ago with Windows 8.1 already installed (64 bit). Today I got a message saying I needed to look at the PC Health, a Toshiba blue message concerning the access agreement, and I noticed that there were three upgrades that needed to be done, the only one I can remember being the Toshiba Video Player. I think that another one had to do with the charger light?
I don't know.
But once I restarted my laptop after the updates I noticed that the special function keys were not working (i.e. the volume, mute, pause and play, etc.). i then went onto the Toshiba Desktop Assist and into system settings and selected the keyboard tab. I then made sure the setting for special function mode was selected.
Now, when that setting is in place, certain keys work but for F3, F5, F6, etc and when I want to use the special functions only the volume up and down work when pressing 'Fn', but special function mode is still selected? Only those two work, not the mute or flightmode or bluetooth, which was working normally before the upgrades.
I have googled but cannot find anything specific to 8.1, or not relating to upgrading to 8.1. I cannot find the flashcard utility and do not want to try something where I do not know what I am doing. How can I get these special function keys working again normally? Sorry for the long message but I wanted to give as much info as possible.
Many thanks,
Melanie

Hi
It sounds strange to me that a Toshiba update (Toshiba Video Player, etc) would affect the function key functionality.
Nevertheless the function key (F1-F10) can be used in combination with or without the FN button. This depends on the special function key mode.
In case you want to use the F1-F12 functions without the pressing FN button, the function key mode should be enabled (should be set to special function mode)
Here the full details how it works:
https://aps2.toshiba-tro.de/kb0/HTD2503B90001R01.htm
Now it these buttons would not work even if the FN button has been pressed, then there is some problem with the software.
First of all I would recommend you to set the BIOS to default because this function key mode can be changed in BIOS too.
After that, check if the key would work. If not, reinstall the
Toshiba Function Key Utility
And Toshiba System Driver
You can also check if the essential service has not been disabled.
Start the Task Manager and go to start up items. There you should enable all Toshiba apps and services and then restart.

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