As of a few weeks ago I know for 100% that the files were perfect. If they are bad now what can I do to fix then and mainly for did it happen.

If it's really been caused by bad files, then there are only the following three possibilities:

- The files were bad to begin with.

- The files were corrupted during the transfer to the player.

- The files became corrupted after they were already on the player.

First situation is an SEP, but you can find out by checking the original copy of these files if you left them on your hard disk after you sent them to the player.

Don't know how to tell the difference between the second and third situations. Also don't know what could have caused the second situation, I've actually never heard of it happening.

The third situation could be caused by disk trouble.