garbled sound

Hiya,
Got a DVDrom, CDrom, and CD/RW. Put in another hard drive so I can now have my CDs music on that one. Disabled the CDrom and just had the CD/RW and DVDrom as there wasn't enough connections for it all. Decided to change it around and disabled DVDrom as I don't use it all that much and reconnected CDrom, I get good playback thro CD/RW going thro Windows Media player, but garbled playback on the CDrom going thro Windows Media Player. Got any ideas please.