I had the Exact same problem and no one had a good solution, i only found one that finally worked after spending 4 freakin hours tryin to fix it. anyway here is the solution.
you need to use a computer that has Windows XP, then if the computer is running any version of Windows media player other than 10, roll back or upgrade to Media player 10. restart the computer.
Now, you need to download and run
http://www.delldjsite.com/forums/attachment.php?attachmentid=462 honestly i have no idea what it does. my guess is it reinstalles the USB ports but thats only a guess. but i was so frusterated by the time i found this solution that i was willing to try anything. so download this file, unpack it and run it. then it will ask you to restart. when your computer is restarted run the new firmware file ( i used 1.62.2.0) and it works.
Why? i have no idea, but it i was pumped. the origional site i got this solution from is
http://www.anythingbutipod.com/forum/showthread.php?t=18864
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