Replying to Ipods are soooo gaaaaay

so i got a new ipod for christmas from my mother and i plug it into the compy put some music on it and plug it in the next day to put more songs on and it wont work and i tried all the usb ports on teh computer and wont charge or connect or anything. So i take it back today and they replace it and i get the new one out of the packaging and plug it in and the computer says the usb device malfunctioned and to unplug it and plug it in again, so i do this and it still doesnt do anything. and last year i bought one that didnt work either..... just thought i'd put that out there and kinda gettin rid o some of my frustration