problems after battery went dead

Hi, after my battery went dead, I connected my Ipod touch 2g to my computer and I got a message from itunes that I needed to repair the Ipod. When I did, the apple logo appeared on the ipod with a progress bar that filled slowly. However, once it was filled, it stayed there (I waited for more than 20 hours, and I detected no change). I then disconnected the Ipod and I received a message from itunes that it could not repair the ipod (error 9).
I now always get the same thing on my ipod (even after a hard reset): a synchronising pictogram (a usb with an arrow to itunes).

Does anybody know how to solve this?