I did something not to have sound in my laptop.

Thanks for the help but, It doesn't have anything to do with Microsoft. By mistake somewhere in my computer, I unclicked a red check mark in the square box. Now, I have no sound. I was in the Control Panel. It has chooses at the top left hand side of the monitor. I clicked on one of them which I don't remember which one. Then something opened showing the word Mute and a checkbox below it with a check mark inside the box. Until I did that I could hear such as listening to my local radio station while I am on the internet.