iPod Keep on asking for restore when connected to PC.

Hi,

I have one iPod shuffle 3rd generation 2GB variant. When i connect my iPod to PC, it is asking for restore. It is giving error " iTunes has detected an iPod in recovery mode. You must restore this iPod before it can be used with iTunes". Then i tried to restore it to factory settings. It is showing restore done. But after restore also it is giving the same error. I am not able to sync music with my iPod.