USB problems when connecting nano..help please

I just received a new nano 4G (2nd gen. i believe). last year i had a different ipod nano on my computer, which worked fine, but whenever i plug in my new ipod into any USB port ( i tried them all), an icon appears, and when i click on it, it says:
The unknown USB device is a HI-SPEED USB device and will funcion at reduced speed when plugged into a non-HI-SPEED port.
Recommendation
The Unknown USB Device will function at reduced speed. you must add a HI-SPEED USB host controller to this computer to obtain maximum performance.
being computer illiterate, i have no idea what to do. the new version of iTunes is installed and works completely fine. my ipod doesnt download any music, it just charges.
please help

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Message Edited by alintatoc on 14-Jun-2009 10:44 AM
Message Edited by alintatoc on 14-Jun-2009 10:45 AM
Attachments:
nokia cable.jpg ‏88 KB

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