My computer is so stupid

Hello,
my name is julia and i just got an i pod touch 8gb and when i turn it on it has a picture of an usb cable and then an arrow then the i tunes simbol and i have the windows vista and i tried downloading itunes 7 and it tells me that something has failed and tells me to retry and i have like twenty times and it still wont work and i dont know what to do and it is getting me verry mad ? help me ?????????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!