Itunes won't let me backup my iphone, what can i do?

When i sync my iphone 4s to itunes i get an error message that says that the iphone can't be backed up because the phone or backup is corrupted. I haven't jailbroken it and i'm running windows 7, i went into edit, preference, devices and deleted the backup but it still won't work. What can i do?

Your running windows 7 on an iPhone?

So you have a 4s and the laptop/PC where itunes is running is a Windows 7 machine, right? The first thing you should do is reset the phone by holding down the home and on/off keys. Then switch the backup type in itunes when the phone is connected. If it's set to backup to iCloud change it to backup to this computer or vice versa, then apply the change. Then change it back to the original backup setting and try backing it up again.

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