Computer's Audio is not working..!!

So, i wanted to mute my mic which is on the screen, next to the webcam, and i accidently uninstalled the drivers. But when I try to update my driver, it says driver is upto date. I've also watched a few videos in which it told me to download a driver, which I did, but for some reason, my computer does not install drivers.. What should i do?

I have a Samsung NP300E5V

Thanks..

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