When i use MPT and try to transfer a ringtone to my motorola v3r i keep getting unable to communicate with phone. I dont know if this is a usb port problem or what. I have vista on one commputer and xp on two others and only one (with xp) works correctly. I have reinstalled the 3.4 motorola driver several times , sometimes it will work then the next time it wont. Anyone have a clue what the problem is, some advice to get me on the right track would be greatly appriciated.