I had exactly the same problem and I fixed it this way:
1.-Click the start icon on Windows XP
2.-Open the control panel.
3.-Click the listen, sound and voice section.
4.-Click the listen and sound devices.
5.- Click the hardware.
6.- Click the C-Media AC97 audio device. There you can read that this device
doesn't work properly and need reinstallation. You click the reinstall
option. Finish.


"Wannablowupmycomputer" wrote:

> Suddenly, for no reason at all, the sound on my computer has disappeared.
>
> For example: if I try to play an audio file in Windows Media Player it comes
> up with the following error report:
>
> 'Windows Media Player cannot play the file because there is a problem with
> your sound device. There might not be a sound device installed on your
> computer, it might be in use by another program, or it might not be
> functioning properly.'
>
> When I ask for more information it comes up with the following:
>
> 'C00D11BA: Cannot play the file'
>
> I have no access to volume control and the computer is telling me I have no
> audio device. I've tried searchin for an updated driver like one of the
> options suggests but I just get told it can't find one.
>
> As someone who doesn't have much of a clue on this stuff can anyone help me?
> --
> Okay. This computer is toast!