Sounds like a CODEC problem.
(Well, from what you say I guess it 'Looks' like a CODEC problem !)
But, we need more info from you about your-
Operating System
The Player you are trying to use (Hopefully not the LW 'built-in player !!!)
Any 'new' players you may have recently installed...
The usual suspects...
If you want to try some stuff first click on >
http://www.gnutellaforums.com/tips-t...tml#post310412
What you need may be included in that thread...