What is "Unknown error" (C00D11CD)" in Microsoft Windows Media Player?

What it usually means is that DRM is screwed up.
I Use musicmatch, and sometimes logging in and
playing the song cures it be re acquiring the license.
I don't know f ms will get upset fo this, but,
check out case SRZ041218000573 if you can.
It's what worked for me in a similar situation.

I actually paid to have a tech support call at Microsoft about this very issue, and here's what MS sent me after our call. I hope that they're helpful for anyone else trying to figure this problem out!

Thank you for contacting Microsoft Online Support Service. My name is Lisa, and I'm glad to work with you. For your reference, the case ID for this service request is xxyyzzyyxx.

From the case log, I understand that you encountered problem with DRM. We will work together to resolve this specific issue through the course of the case. If there has been any misunderstanding, please let me know.

This issue may occur if the DRM was corrupted. According to the symptom, I suggest that you perform the following steps to reset the licenses:

1. Open Windows Explorer.

2. Click Tools, and select Folder Options.

3. Click the View tab, select Show hidden files and folders, uncheck Hide extensions for known file types and Hide protected operating system files, and click OK.

4. Temporarily move the licenses file from 'C:\Documents and Settings\All Users\drm' to another backup folder.

5. Delete the following two registry keys:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRMand] and

[HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General]

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved.

1). Click Start, click Run, type "regedit" (without the quotation marks) in the

Open box, and click OK.

2). Click the plus signs (+) next to the following branches to expand them:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM]

3). In the left pane, right click the 'DRM' key, and click Export.

4). Save the DRM branch as a .reg file. (You may restore this branch by double clicking this .reg file later.)

5) In the left pane, right click the DRM key, click Delete and click Yes to confirm.

6) Repeat the above steps to backup the following registry key and then remove it:

[HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General]

7). Close the registry editor.

Upon consideration, the questioner could be attempting to play licensed content obtained on a P2P site. The real rub comes when someone with 400$ + in licensed content tries to upgrade components a tilts the XP Activation process.

My experience was that when my original cola ran out and I had to use the manual activation process is when the DRM got hosed. Fortunately, I only had 20-30 tunes to go thru the license reactivation process.

Microsoft has a lot of work to do in this area.

was trying to buy music off of walmart.com, but when I tried to listen to the song first and got a message that said windows media cannot fullfill my request because there has been an error, and my proxy settings need to be corrected. What does windows media need to be set to?? I contacted aol (my isp) and was told it was windows media that was causing the problem, and not them.

What does this mean...and how can I fix it??

I've got an interesting error. Several of my MP3 files I have in a certain folder of my computer that the " .mp3 " files constantly have either " .exe " or " .zip " added to the end of their file extension. And when I attempt to remove the " .exe " or " .zip " part from the file extension, I still cannot play it in media player. It gives me unknown error C00D11CD. Any advice on how I can fix this? I obtained the music by coping CDs I own to my computer(So p2p viruses in the music is not possibley the reason).

Honestly, sounds more like litter from a virus or some spyware on your system more than any sort of glitch with your music software!