Windows 10: Since about two weeks ago when an update came out my "c" key on my keyboard will not work

I'm having an issue with the "c" key on my keyboard. It started about two weeks ago when I updated to a new patch. Now when I try to use the "c" key on my keyboard it will open either the Alt menu if I have a internet window open, or it will open the calendar app if I do not have a window selected. This is very frustrating because I cannot type anything using my keyboard as if I hit the "c" key twice by mistake it will close what I was working on.


I have searched through all the options and settings and cannot figure out what is causing this issue, so any help would be welcome.

PS. I had to use the onscreen keyboard to type this question out.

:)

 

Keyboard Volume Keys not working while in-game

I happen to have used the Tt Challenger Pro keyboard in the past, and the volume keys worked flawlessly in every game, so it's indeed a weird problem. I would suggest the same thing sneekypeet suggested, using the keyboard software and assign this function to a hotkey, but you said that didn't work either, so yeah...

 

Built in keyboard not working

I recently purchased an ASUS ROG GL553VD Notebook Computer and a few weeks ago the keyboard stopped working. After a few restarts it worked again, but today the problem came back, and was not fixed by any amount of restarting. Several people on past posts said to reinstall they Keyboard driver, but there was no Keyboard section in the Device Manager. I am currently resetting the laptop to factory settings to see if that fixes the issue. Any other suggestions would be greatly appreciated.

 

Keyboard Media/Volume keys not working, only on this computer, and only this keyboard

The media keys, volume knob, sleep button and mute button on my "Das Keyboard 4 Professional" keyboard stopped working a few weeks ago after a reboot that I think was caused by a Windows Update.

I've tried the following steps to try and solve the issue:

• Try a different keyboard - The media keys on a logitech wireless usb keyboard work fine, even in the same USB port.
  
• Try keyboard with another PC - When plugged in to my laptop the Das Keyboard media/volume keys work fine.
  
• Try another USB port - No difference
  
• Tried completely wiping any trace of the keyboard from the registry/device manager, then plugging it in again - No difference.
  
• Created a new user on the PC - No difference.
  
• Ensured the HID Human Interface Service is running.
  
• Disable touch keyboard and related services.
  

What could be causing this?