Unkown device help - have already checked other posts

I am having the "unknown device" problem.
I have a nano, computer is running XP pro. The computer used to work properly with the nano, now it is showing as an unknown USB device.
THe nano and cable both work. When I hook them up to another computer, I have no problems.
The nano does not show up as a device in computer disc managment or "my computer".
I have tried checking the isbstor.inf file. It exists.
I have unistalled and installed the latest ipod software.
I have tried rebooting the computer with the nano plugged in - this freezes the boot process right at the beginning of the boot sequence (although surprisingly, that is the only time the nano says "do not disconnect", but this does no good, as I can not boot the computer). I have tried plugging it in later in the boot sequence, with the same result. If I wait to the commencement of the boot of XP, the computer boots, but I again have an unknown device.
I have tried putting the nano into disc mode, and then plugging and unplugging the nano - still unkown device.
I don't appear to have a drive letter conflict. I have 2 drives, one with a c drive only, the other partitioned d-g, and two dvd drives, G and H. (although I haven't gone to the step of changing all of the drive letters above C, as I am not sure if that will affect the opertaions of them). I have tried disabling the 2 dvd drives and replugging the ipod - no luck.
I have updated the nano on another computer with the latest updater. Still unknown device on the problem desktop.
I can not do a "retore" on this desktop, as the device does not show in the updater.
The only thing I have not done, is to uninstall itunes and reinstall, but I doubt that will help, as the computer is not recognizing the nano, other than as an unknown USB device. I can't see it in computer management/disc management.
Any assistance would be gratefully appreciated.
Thanks
Steven

it's no problem. i have a reasonably wide definition of what counts as an ipod connection issue.
okay, i think i tracked down the relevant ASUS support pages:
http://support.asus.com/technicaldocuments/technicaldocuments.aspx?SLanguage=en- us
but it might be worth checking in at the general ASUS support site just to see if there's any relevant troubleshooting info there:
http://support.asus.com/default.aspx?SLanguage=en-us
(always a good idea to be cautious about these matters.)
love, b

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