Can not play in Itunes
 

When I download from Limewire the files are sent to Itunes. But I can not play the songs out of the Itunes library. I keep getting a rebuffering prompt and 1 second of the song plays. I set the default program to automatically convert the files. Can anyone help me please.

ok, after some time I have figured out that some of the songs are not being converted but when I try to play some song I get a prompt that says the files can not be played because they are Napster files. It prompts me to download Napster. Is this safe and if I do this will I automatically be able to play songs in Limewire or Itunes or will I have to go on to Napster?