When Win 10 updates it has been known to turn System protection off.
In normal mode open Windows Explorer - right click on This PC and select Properties then click on System protection where it should say if it's on or off with a button to click on to turn it on.
This YT video looks useful to resolve that error code - pause it and write down the instructions and then apply them.
https://www.youtube.com/watch?v=WCUSROqMH20You haven't said if you have a red cross on the speaker icon in the task bar.
I have known of adware taking out audio but reinstalling the audio driver has resolved that.
Right click on the Start button and select Device Manager and in there click on View/Show hidden devices and expand Sound video and game controllers.
Right click on the Realtek HD Audio and select Properties where it will give its status.
Under the Driver tab will show which version you have.
I don't know if mine is up to date but that shows as 18/06/2015 version 6.0.1.7541
If you see any yellow alerts or red crosses let me know.