Codec Errors C00D1199

I have about 100 songs that I can not play in WMP11.0 I see in my music
folder, with size but no time associated in WMP, in I-tunes, not there at
all.

I have downloaded several things, about 3 codec packs, still hasn't helped,
registry cleaner, still hasn't helped. I just ran the codec package for MWP
7+, Installation, I am trying now.

Can't think of what to do next. Please help if anyone can.

http://www.free-codecs.com/

Codec packs do NOT help these kinds of things. Most are incompetently
installed collections of beta sofware, which really isn't a kind thing to
install to one's system. =(

What specific file types are you having problems? Are you sure the files
are still valid?