Hi and Welcome !
So...
What's new ?
Don't mean that as a joke !
What, if anything has changed ?
New installation of a player ?
New CODEC Pack installed ?
Update or fresh install of a new version of Limewire ?
ANYTHING that you may have recently installed or removed ?
Is the problem limited to only a small number of files and do all of your other music files play OK ?
And, what player are you trying to use ? If it's the one in Limewire, forget it !