|Is there a speaker icon in the bottom right? If so right click and open the volume control and make sure volume is turned up and not muted. |
If there is no Speaker Icon
Go to Control Panel > System > Click on the Hardware Tab > Click Device manager > Then locate the Sound, Video, and game controller. If there are any listings there please list them here. Also check to see if there are any icons that have a yellow ! or ?. If so please list.