The CODEC required to decompress '.mp3' could not be opened.

[Novacane]

When I try to decrompres some mp3 files i get this message:

The CODEC required to decompress '.mp3' could not be opened.

The files don't play in windows media player and mediamonkey.
What do I need to do?

I tried it with the new version, this is the error:
Error valid mp3 frame not found. [clsMAD::Init]

[LtData]

It sounds like your files are corrupt if they don't play in WMP or MediaMonkey. Where did your files come from?

[Novacane]

downloaded it from isohunt with bitlord

[LtData]

Looks like you got corrupt files for whatever reason.