ITunes won't sync after computer was reset

I had a problem with my iMac and had to take it back to factory settings, and reinstall Leopard. My preferences did not carry over, so I had to drag numerous folders and files from the Previous System folder into the new system folders. Just about everything is working fine, except I cannot sync my iPhone or my iPod. When I plug them in, I get the message "iTunes cannot read the contents of the iPhone (or iPod). Go to the summary tab in iPhone (or iPod) Preferences and click Restore to restore to factory settings.
I am very reluctant to wipe everything off my iPhone and iPod. Some of the information on there is not stored on the computer. I am sure there must be something in the Previous System folder that needs to be moved to current folders in order for these devices to be able to sync. Any ideas?

Thanks! OK, I found that folder, but have questions pertaining to it.
Where do I drag it?
There are two files in there, both without "names", other than lots of letters and numbers. When I move them, can they be read, or are there psl lists (or whatever they are called) that need to be moved, also.
Does this mobile sync file pertain only to the iPhone? If so, is there a similar folder I need to find in Previous System Folder for the iPod?
Thanks so much, I really appreciate your help.
Joey C 2

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I hope someone out there has the expertise to tell me what I am doing wrong. I expect a learning curve from a new Mac operating system, but I don't expect weeks of problem solving and glitches. Lion...well, they won't let me use that word.
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Sometimes I'm confronted with a screen that wants me to check or uncheck each and every album (but not songs) that I want synced. I have already kept up to date a more specific and complete list of the same sort elsewhere in iTunes: the "Music" list in my itunes "Library." Today I unchecked some songs and checked some others expecting to easily have the corresponding changes made on my iPod, as I have for years. This is the list that I have refined over the years based on new music acquired, my changing tastes, and room left on the iPod. Am I really expected to duplicate this process on another list only to end up with no options for individual songs I do, or do not, want synced? What is the purpose of this exercise?
I finally got it to upgrade to iTunes 10.6.3. I was repeatedly getting a message in iTunes that there was an upgrade available. I would hit upgrade within that mesage in iTunes. It would go through the process of checking for new software and then tell me my software was up to date. (I was running iTunes 10.6 (40).) Software update also told me my software was up to date. I had to go to the Apple site to find and download and install iTunes 10.6.3. The change made no difference to the above problem. I'm not used to screw-ups like this from Apple.
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In lieu of relaxing on Sunday, I've been working on this.
I tried launching Thunderbird (TB) in TB's "Safe Mode". This launches TB like it's being used for the first time - and it didn't crash, which got me hopeful.
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It's this simple. My iPhone and iPods synced up fine with Snow Leopard las week but do not open iTunes or appear when iTunes 10.4 are opened.
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Nothing working yet.

Peter,
Let me be clear. When you say "I just deleted that one file…" it's a bit grey as to what you're referring to. When I try your first two steps…
Disconnect the device and quit iTunes.
In the Finder, locate iTunes in the Applications folder and drag it to the Trash. (This will not remove any of your iTunes media or your iTunes library.)
… I cannot drag iTunes to the trash without getting "iTunes can’t be modified or deleted because it’s required by Mac OS X"
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Wha La!
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It certainly made my life less frustrating
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I know that most of these posts were put up a little while ago
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Corruption
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I changed my selection to manually manage music and videos and tried another sync
Wha La!
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x

ITunes won't sync after computer was reset

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