I just built a new computer and installed Windows 7 and itunes 10.4. My old computer had Windows XP and the previous version of itunes. My 3Gs is jailbroken and is on firmware 4.1. I can't get my phone to sync with the new computer. itunes recognizes the phone, runs a backup, then locks when it starts to sync. I have tried rebooting the computer, resetting the phone, uninstalling/reinstalling itunes, but nothing has worked. The phone synced flawlessly to my old Windows XP computer. Would love some help to fix this. Thanks.