iPod Nano 1gen

Hi. I have an iPod nano 1gen, and in the iPod screen, its asking to restore with iTunes. The first time I connected, it worked and all, I pressed restore on iTunes... Then it said to keep the iPod connected. It stayed connected for about 5 hours and nothing happened. So I disconnected and connected again. Now iTunes wont recognize the device, it wont show up anywhere, even though it is connected. What should I do? Please help!

(PS: My computer is Windows 7)