IPOD USB DEVICE NOT RECOGNISED

Hello,
i am using an IPOD 30 GB.. whenever I try to connect it with my Laptop (OS Windows XP) it shows an error USB DEVICE NOT RECOGNISED.. if I try to attach my friend's IPOD to my PC it works properly.. its only my IPOD which isn't working on my PC.. I even tried to attach my IPOD to some one else's PC.. it again shows the same error.. I downloaded the latest itunes, but that also in vain.. I have been using this ipod on this computer previously.. but since I formatted this PC this problem is occuring.. I don't know whether this problem is of my PC or my Ipod..

Thanks in advance..!!