I have about 100 to 200 mp3's downloaded off WinMX. When I am transfering them from my computer to my walkman, some transfer and work while others do not. The ones that do not usually go about 10 to 15% into the process and then a pop-up box shows up saying file cannot be transfered, copyright info is not correct or there is none? What does this mean and is there a way to correct this. Pretty much every MP3 I have is giving me the same fits, thanks !