i just got a new mp4 player for xmas today and everything was installed and ran fine. however the second time i plugged the usb cable into the pc it was not detected by the computer. i am using windows xp and i just got all the updates i dont have. everytime i plug the player in, the screen lights up, but the computer cannot detect it. this has happened to my graphing calculator also. i also reinstalled the drivers for the usb ports too. the player i am using is creative labs zen portable media center. any help is appreciated.