have the same problem, ipod nano 1st gen. tested with win7 and vista (both 32bit) on two different notebooks.
ipod drive in explorer is visible and accessible.
rockbox utility detected ipod nano 1st gen, but nothing underneath usbdevices in the systeminfo of rbox utility.
fast help would be nice, cause its the ipod of a friend.
thx
[update] me was told it is a nano 1st gen. but itunes said its 2nd. my fault sry.