I recently had my Windows receive the blue screen of death and had to reinstall a new copy of Windows 7. When I attempt to install the iPhone 4.2.1 software on my iPhone 3GS after it transfers purchases I get an error message that iTunes could not back up the iPhone because the backup was corrupt or not compatible with the iPhone. When I click Edit -> Preferences to go into Devices and delete it my list of backups is empty, which makes sense as it is a new computer. When I attempt to create a backup of my iPhone for my new computer I again get the corrupt or not compatible message, even though there is nothing I can do to delete it. I am running iPhone software 4.1 looking to upgrade to 4.2, as well as iTunes version 10.1.2 on Windows 7. Thanks for any help!