error code COOD11B1

[E.R.M.]

I've read the other posts that looked like the same problem but everyone
else's problem is mostly with they're sound card or something like that. I
just can't play music, well I can play some music just not all. All the files
are still in my music folder WMP just won't recognize most of them. Any
solutions?

 

[Mark L. Ferguson]

Using codecs:
http://www.microsoft.com/windows/windowsmedia/player/faq/codec.mspx