I assume he means that he doesn't have rbutil on his computer, and that he does have Rockbox on his ipod as he says:
He downloaded Rockbox onto it, and now I cannot get it off.
However, Rockbox has nothing to do with USB connections etc, that is all handled by the Apple firmware. If you plug in USB it should automatically reboot to the Apple emergency disk mode. Furthermore the manual describes how to dual boot to the Apple firmware, from where it is like Rockbox isn't there.
If you still can't connect and itunes refuses to restore (just as it did before you installed rockbox), this sounds like there is something more fundamental wrong with your ipod, and nothing to do with Rockbox.