Windows 10: All "F#" keys aren't working, except for F1, F2, and F3

I am trying to talk with a friend, though when I try to turn on my microphone with the F4 key, nothing prompts. I try the F8 key, nothing happens, and so on. F11 and F12 still work,, though everything else does not as I know. Thank you.

:)

 

The f1 key and the f2 key do not work

Original title: [phím f1 và phím f2 không hoạt động]

Moved from: [Windows / Windows 10 / Windows settings]

 

How to make the F1, F2 and F3 keys no longer control volume.

I usually use the F1, F2 and F3 keys a lot in certain programs but recently after a Windows update that occurred while I was using my computer a few days ago, these keys are now set to Mute, Volume Up and Volume Down. I was wondering how I can disable
these so that they have regular functions again. I can find answers for Mac online but nothing for Windows, I've tried searching in the community here too. Thanks so much for your help! ;D

 

my dell laptop with windows 10 has keyboard buttons not working , esc , F1 F2 and others numerics not working

I have installed windows 1o home edition , I have now problem with my keyboard buttons , the keys F1 , F2 , esc and other some of numeric numbers are not working . when I press F1plusF2plusF3 then caps lock light turns on and when I press again then
it turns off . actually My F1 , F2 , F3 buttons are made for sound volume , F1 worked for mute , F2 for decrease the system volume and F3 for increase volume , the button F3 works correctly but F2 and F1 don't work , also escape button doesn't work , I thing
these buttons are functionally disabled , because when I press the three keys at same time then the caps lock light glows , I think it is not hardware problem . thanks in advance for solution.