Hi Compsys,
Welcome to SysChat.
If you can't hear sound in the Windows Media Player, the Player may be having a problem with your sound device.
Follow the steps below:
1. Reinstall your sound card drivers. You may download the latest version from the maker of your sound card.
2. Reinstall DirectX. You can download it from
here.
3. Restart your computer
If problem persists check out Microsoft Knowledge Base Article
Windows Media Player Cannot Play Back the Audio Stream