Go to your Device manager, Check : Sound, video and Game controllers.
Check anything with a speaker at the beggining is there?
If so, goto your control panel and find 'sound'. There, you will find if you have anything available.
There is 4 tabs if there is nothing to test, then you'll have to run your trouble shooter.
Have your internet activated. The program should be able to detect if no file is there and should
go looking for it on the internet, Installation disc, or inside it's own system files.
Normally, if something is missing, it usually tries to find it on BOOT. and installs it of it is available on any of the above.
Else, look for the speaker icon in the task bar on the right, and turn off the 'MUTE"!