ipod classic connection to laptop: BlueScreen crash dump

On connection to computer(s!) - windows 7 - ipod classic creates a bluescreen crash dump/won't connect to itunes. all itunes/computer software up to date/factory reboot ipod numerous times/turned protection software off/tried different leads/computers/usb suggestion via apple site. shows as a hard drive though. no luck via apple support so if anyone can advise? . thanks