theyoung

I'm pretty sure the problem doesn't come from a certain type of mp3 but just one of those that are cheeper. The reason I am saying this is because one of my friends bought an mp3 called missil and when I tird to install in on my computer my usb ports started to malfuntion(well 1/2) and the other one reads it for about 2 secondes and then malfuntions... I have no clue what to do. Also when I plug in my psp and try to put in music it starts downloading for a seconde and then the usb isn't recongnized anymore? Any help?