C00D11CD is "Unknown Error".  Generally it doesn't have a single solution or
answer.  To help us figure the real problem you it would be great if you
could provide some more basic information about the problem.  That being
said please read on for some basic troubleshooting help for the error.

If none of the information below helps you will need to provide us with *as
much* information about the problem as you possibly can. - See
http://www.zachd.com/pss/pss.html#isolate

For a few common solutions to error C00D11CD, please see
http://www.updatexp.com/c00d11cd-error.html

Q: Are you playing an AVI?
If so...You likely don't have the right codec installed for that specific
AVI or you have a bad install of the codec.

Using a DirectShow decoding filter such as FFDShow will decrease the
problems you could run into with codec problems.  FFDshow will decode XviD,
DivX 3/4/5, 3IVX, and has support for many other codec's.  It can be
downloaded at
http://sourceforge.net/project/showfiles.php?group_id=53761&package_id=48261&rel
ease_id=95213.
(Download ffdshow-20020617.exe and then run it's installer)

If you have the correct codec installed and the video still doesn't play
download GSpot (Below) and run your AVI though the program.  If Gspot says
"Failed to render", "Missing Chuck", etc. then your video file is corrupt.

If you just wish to install the individual codec's for your specific video
or FFDShow doesn't support the codec for you file please do the following.
- Download and use GSpot (http://www.headbands.com/gspot/download.html)
- Run the installer, open GSpot, goto File>>Open.
- Look for the 4CC code for the file's Video Codec
- http://www.zachd.com/pss/pss.html#codec will help you.
(Or post the information back here and I can help)
-If you don't get audio, what codec does it use?  GSpot also tells you this.

Q: Are you playing any type of content directly from a web link?  (Streaming
audio, video, radio, etc)
If so...You must provide the exact link to what you are trying to access.
The homepage isn't important, but an exact link to the content is.

Q: Are you playing an MPEG/MPG file? (DVD, SVCD, and VCD)
If so...Please reinstall DirectX.  This will overwrite quartz.dll and
re-register it in Windows.  quartz.dll is the MPEG Decoder that WMP will
default to.
(http://www.microsoft.com/windows/directx/default.aspx?url=/windows/directx/
downloads/default.htm)
If reinstalling DirectX does not help please provide the following.
-Does it only happen with a few MPEG/MPG files?
-If so...It's most likely a file encoded with the MPEG-2 codec.  To decode
this you will need to install an MPEG-2 decoder.  Follow the link to more
information. (http://www.zachd.com/pss/pss.html#mpeg2)

Q: Are you trying to burn a CD?
If so...Please see http://www.zachd.com/pss/pss.html#xpcdburn.  That being
said the IMAPI burner that is included with WMP isn't very good.  If the
above link doesn't help goto
http://www.wmplugins.com/ItemDetail.aspx?ItemID=228 and, download the free
Nero Fast Burn Plug-in.  This plug-in will *not* burn DRM-enabled WMA's
(Those downloaded from pay sites like Napster, MusicNow, etc.)  If you are
looking for better software for burning CD's try Roxio's Easy CD/DVD Creator
or Nero Burning ROM.

Easy Media Creator
http://www.roxio.com/en/products/ecdc/index.jhtml

Nero Burning ROM
http://www.nero.com/us/index.html

Q: I having problems playing and/or burning DRM-enabled WMA's. (Ex.
Wal-Mart, Napster, MusicNow)
If so...Your best bet is to ask either the support provided by the site you
bought them from or contact Microsoft Support.  No one who regularly posts
in this newsgroup knows a great deal about troubleshooting DRM-enabled
files.

Microsoft Product Support
http://www.zachd.com/pss/pss.html#psssupport

Q: Are you having problems playing MIDI's?
If So...Please see http://www.zachd.com/pss/pss.html#midi.  That should
cover most MIDI issues.

Q: Are you trying to play a MOV, RM, RA file?
If so...Please goto
http://support.microsoft.com/default.aspx?kbid=316992&product=w98 and notice
that those are not supported file type in WMP.  You need to use RealPlayer
or RealOne for RM, RA, Etc.  And then use QuickTime for MOV.