why isnt my mp3 player working?

i really need help with my mp3 player, ive spent hours trying to fix it. it is a olin mp3 2gig player. when ever i put it in any computer, xp or vista it shows on my computer but when i either try to open it to put files on, or right click it, it freezes my computer as in "Not Responding" and i have no clue what to do. but when it lets me in it, it has 3 hidden files that arnt related to the mp3 and that i cannot delete because if i delete one it auto-matically copies all of the 3 back. ive tried formatting numerous times and nothing. and when i try to put songs on it, the songs wont actually go on it. it just stays at "estimating time" please, can someone help me?