ITunes fails to sync correctly, fails to recognize most data on iPhone

I have a new iPhone 5 that has had a tough childhood due to retailer errors that made it difficult to get running as a phone. Now that those are ironed out, I am having chronic sync errors that I guess are associated with iTunes.
I stopped syncing Podcasts and abandoned iTunesU due to unpredictable behavior in both. Now even music syncing is failing. There is always a discrepancy between what is listed in the Music app and what has actually been copied to the phone. So I select a track and get a "red circle" icon beside it, and the player skips through a series of absent tracks until it lands on one that was actually copied.
When I plug in the phone and view the iPhone screen in iTunes, the bar at the bottom usu. shows only one type of data: "Other." As I go through the motions of syncing, "Audio" reappears during a sync, then usually disappears again. Syncs aborted with the dialog "The iPhone <NAME> could not be synced because the connection to the iPhone was lost."
I went through escalating steps to troubleshoot iTunes, did a hard reboot of the phone, restored the iOS software, and deleted the iTunes photo cache. The "could not be synced" dialogs went away, but the syncs continue to fail.
I read in another thread about deleting corrupt elements of the iTunes software that have to do with syncing, but no details were given. What should I do about this?
iTunes 11, Mac OS 10.6.8, MacBook2,1
iOS 7.0.4, iPhone 5

exactly same issue with iphone 4, Win7 64 bit, Outlook 2003, itunes 10. Everything worked fine until bought new laptop running win7. Now in Itunes I cannot select which contacts or calendar to sync to - no options to choose from. The I get the Sync failure message.
Problem Event Name: APPCRASH
Application Name: com.apple.Outlook.client.exe
Application Version: 17.80.0.21
Application Timestamp: 4c5c2baa
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7600.16559
Fault Module Timestamp: 4ba9b29c
Exception Code: c00000fd
Exception Offset: 000324b8
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 2057
Additional Information 1: 26c6
Additional Information 2: 26c610ab47ac0522736f8f65ca065292
Additional Information 3: e6d1
Additional Information 4: e6d11238301c9516ca1a84f630312aee

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