i just bought a sony ericsson 580i walkman phone and im tryin to upload songs to use as my ringtones, i have the songs as a small file their like 30 seconds each, im following the directions but when i connect the usb from the phone to the computer, nothing shows up, i dont know how to add them to the phone. or where to put the files. the computer stays as it is.. anyone HELLLLLLLPPP?