I have Media Player Classic 1.3.1249.0 (x64) and installed CCCP 2009-09-09
Your custom mpc won't use anything from CCCP at all to begin with. So start by removing it and resetting the settings for CCCP, then using the included mpc-hc.
I thought CCCP is supposed to have every decoder imagineable!
No idea why you would think that CCCP is total crap and still post here. And not like the message says anything about decoders anyway.
Make sure you are using one of the EVR video renderers, and that your DVD drive is set to the correct region.
Neither of those should be necessary, though not really sure about the latter.