songs gone, memory still taken... Please Help!

ok so basicly, i have no idea what is going on with my ipod. I was listening to it through my cp speakers (directly connected to the ipod, not cp). Anyway it had died when i forgot to turn it off, and left the house. When i came back the ipod battery was dead and ipod off. i hooked it up to the cp via usb cord. the itunes poped up and it said would u like to register ur ipod? and i did again sice 8 months ago, then when i closed the window it showed that all of my songs were gone!, but the memory of holding the songs were used? please help me find out whats go on.

gateway Windows XP