IPOD Nano 4th Gen won't connect to my computer

I've changed the chord many times, i've uninstalled then reinstalled the real itunes, i've reset and put my ipod on flight mode but nothing works. The ipod will connect to every other computer but mine, my computer is a Windows HP w1907 and my ipod used to connect to it absolutely fine but then when i updated my itunes to the newest version, suddenly it won't connect which is really frustrating :/

Please please help! Thank you!