Whenever I Try To Install iPhone OS 4 on My iPod Touch 2nd Generation 16GB It Will Always Get Stuck On "Backing Up iPod Touch" On The Computer And The Progress Bar Only Has I Bar And Will Not Fill Up Anymore. Ive Tried Everything, I Restarted My iPod, I Restarted iTunes, and I Even Restarted My Computer and It Still Will Not Work. Im using Windows XP and I Really Want iOS 4