I pod nano cannot be restored

I have a 5th generation I pod nano. Tried to transfer new music. My computer locks up every time i plug it in. I received a message that it could be corrupt and needed to be restored. I attempted this w no luck. I read how to put the device in disc mode which i did but my computer just locks up. It doesn't give me the option to restore. I reinstalled the apple software as suggested. I have the latest I tunes and my computer is all up to date. The usb port is not damaged and came w my I pad. It is not a 3rd party device. The ipod device never shows up in devices when connected. What can i do to fix this?