I upgraded my iPhone 3GS to iOS5 today. After software upgrade, I tried to restore my data from the backup that was made at the beginning of the update process. But I get this message: "iTunes could not restore the Iphone because the backup session failed". After a lot of investigating, I even tried to make a fresh backup of an emtpy iPhone and restore it, but the same problem. So it seems that backup/restore is not working at all. So my iPhone is now empty (no contacts, SMS, app settings...). I tried running iTunes as Administrator on my Windows 7, but it doesn't help. Any suggestions?