Continuation!!!problem i tried to connect it before here on my computer and it works it appear on My Computer but then when i try again to add now it doestn recognized anaymore....no I havent tried to connect with other computer.....

As strange as it may seem, i have seen USB devices work one time and then be dead the next time you plug it in. I would try to connect it to another computer Or another USB plug on your current computer. If that doesn't work, You might try removing the driver for this device (if it has a driver for your MP3 player) and reinstall it. If when you connected it the first time the computer did not ask you to install a driver then the operating system already has the driver installed for your device.

Good Luck!