Need more info to troubleshoot, but I'll give it a shot: Does the Ipod connect to the PC via USB or Firewire and are the drivers for those devices installed? Without the Ipod connected, go to Device Manager and make sure you have no exclamation point, question mark or red "X" icons next to those devices (there shouldn't be icons next to any of your devices, either.)
Is the Ipod software installed on the PC?
alzan