iPhone 2G will not connect to iTunes

my friends iPone 2G is disabled and asked if I could unlock it which is normally not a problem but when I go thru the steps of unlocking the device it will not connect to iTunes, but my computer recognizes the device when plugged in. I am running the latest version of iTunes on Windows 7. I have even tried restarting the Apple mobile device service in Windows, tried restarting iTunes, and restarting Windows all together. Nothing I have tried works, I have searched online and all I can find is to make sure it is the latest version of iTunes which I have already installed on my computer, I am open to any suggestions to fix the problem