Sound problem Windows Media Player cannot play the file because there is a problem with your sound device. There may not be a sound device installed on your computer, it may be in use by another program, or it may not be functioning properly.

As you may have already notice, there isn't a problem with your driver.
However to gain a better understand the problem you rule out a couple of things. However, if the this problem is only present in windows media player. Then you should try another play i.e. VLC media player.

1. Go to you device manager and make sure the device is working properly. If not try uninstalling the device, restarted the computer letting windows discover the device again.

2. Next go to windows media player file (press "alt" key to get toolbar in newer version. Select options -> devices select your speaker -> properties and be sure that your audio device is available and selected.

3. Finally if all these options has failed, please use an alternative media like the one mention above (VLC media player).

I hope this have been a great help in your troubles. Please provide feedback on the solution.

Your sound card might be in use by another application.

0xC00D11BA: Cannot play the file
Windows Media Player cannot play the file because there is a problem with
your sound device, such as a sound card or sound controller. You may
encounter this error message for one of the following reasons:

Your sound device is in use by another program. Quit other programs that may
be using your sound device, and then try to play the file again.
Your sound device is not functioning properly. To troubleshoot the problem,
see the Sound Troubleshooter in Windows Help or refer to your sound device's
documentation.
You do not have a sound device installed on your computer. Install a sound
device, and then try to play the file again.
Error ID = 0xC00D11BA, Condition ID = 0x00000000

First Check you have Properly inserted Speaker Jack in right Jack in your computer sound panel. and also make sure that speakers are working perfectly.

if above connection are Ok then Try to play Other Music files in other Music Player like WinAmp, Cyberlink etc... If sound is comming then Install newer version of Windows media Player. other wise there is

If this is the promblem with any music player in your computer than their is no sound driver installed or some sound files are missing to check if the sound driver is installed you can open the control panel---->sounds and check if the driver is installed if it is not you must install it using the motherboard CD that came along with your Pc

try updating the version of windows media player to the latest, 7 i think.

nese sito los drive del sonido y me da este erro por que no tengo los draiver que puedo aser

Sound of my Pc is disapeared I think drivers are missing what should I do ?

try to uninstall the software and then the soud card of your computer.. then attach it again and install the software.

In the windows media player go to > now playing - more options - devices - speakers then changed the audio device to use your soundcard.

Also, uninstall any other players, they usually interfere with each other.

If you are able to hear sound while starting PC issue is not with sound card. that is installed and working properly. If you are clicking on any file that is not playing then window media player is not supporting that file. If you are directly opening window media player from start>>Program>>access>>>>window player and it is giving error. It mean that your player is corrupted. You can upgrade that with higher version of player by going this link. www.microsoft.com/windows/windowsmedia/9series/player.aspx