|Don't worry. follow the steps as you can do.|
check the "Speaker" mark on your right side of task bar corner.
if you can see, than check by increasing and with other settings,
if the speaker is not locating on the corner, go to control panel --> sound --> here u can see the speeker mark, open it, if u can see all tablets working, or you can make changes with that.
if those radio buttons are not working, than check that sound driver is installd or nt.