That leaves you with either a bum cable or device.
I am running XP Home/SP2. Until about two weeks ago, wverything was fine. Now, the computer does not recognize my Zen Vision:m 30 Gb MP3 player. I have tried to manually install it, switch the USB cable into different ports, tried it on a different computer, etc. Nothing works. It is simply not recognized. I am waiting for an answer from Creative customer support, but I hoped someone here had some advice.