Hmmmm I've seen something else about WinMx .... any way that aside, If you go to Preferences/options>player, ensure Limewire player is unchecked.
go to options/preferences > saving and select your WMP folder(I assume that's what you do as I'm not a Windows user) ... as your saved folder,
you may then have to reset your songs to use WMP as their default player, and you should be back in business.
I hope this helps as I'm guessing bit
but let us know if you still have a problem
btw Limewire will not burn CDs ... as I think you have worked out.