---here is a post from this forum in 2005 (i am having a similar problem, the difference being i wiped win2000 completely off and installed windows xp):
Hi, my name is Gabrielle and I have just recently reformmated my computer due to various problems. Everything runs smoothly now but I have NO sound. Everytime I open windows media player and try to play something I get: 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.
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
I don't know what happend. When I go into control panel and click sounds and audio devices I can not change any of the settings because the colors are like, dulled so when I try and click on anything nothing happens. It also says no audio device under the volume panel. I don't see what's wrong because I had sound before so I don't know what could have happend. I'm only 15 and I'm not really good with this system talk. Please help, thanks in advanced.
---here is one response from someone called 'ant':
Do you have any CDs that came with your computer (i.e., Motherboard, Drivers, Support etc)?
Go here:
www.belarc.com
and download Belarc Advisor.
Install and run the program and tell us what it lists under 1. Main Circuit Board/Board: and 2. Multimedia
__________________
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There are only two men I trust with my computer. One's me. The other isn't you.
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---i did belarc download. under multimedia it says 'none detected' yet i know i had something there 2 hours ago. under main cicuit board it says: 'Board: MICRO-STAR INTERNATIONAL CO., LTD MS-6738
Bus Clock: 133 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 01/09/2003'
---thanks for any help