Ipod nano 1GB Silver

Hello.. Well actually a few weeks before i bought the ipod nano 1Gb,i downloaded itunes,but when i plugged my ipod it was recognised only as removable disk(USB mass storage). Itunes did recognise my ipod. I thought i must download latest itunes' version and i did it but still same problem. So i opened my computer and and copied some musics into removable disk f (that is the ipod) but when i play the songs only 10 music can be played then it restart,i tried to play the other songs but its keeps on restarting,so please help me.. Why itunes cannot recognise my ipod? Why when i copy songs dirctly,only ten can be played? please help me????? Please??