Resolving Player Problems
If you cannot hear or see the video, the problem likely is that either the media player has not been installed, or your computer network is operating behind a "firewall" that is blocking reception of broadband media.
A firewall is software or hardware used to keep unauthorized users from accessing your computer, but it can also block incoming data, such as our audio.
First, make sure that you have a recent version of the player and download a newer version if necessary. If you have the most recent version, check whether there is a firewall enabled on your network:
Helpful links for the Windows Media Player: