Itunes?

I just recieved a new sandisc m240 for my birthday and my sons lap top has I tunes with the music we have purchase over a year now. When we tried to down load some songs from my playlist we werent able to and I am getting the impression sandisc is an exclusive partner of napster.

Is this so? Can I use I tunes or not? If not is it possible to transfer itune files to napster and use the napster system as a manager?

You need to convert them to mp3 in iTunes.

Thanks for the help.

Vino