Backup for Iphone4G and restore from backup to Iphone4S,but can not sync the applications? What's going on ??

I backup my iphone4g in Itunes and then restore from backup to Iphone4S, the contact numbers, messages and pictures all can sync..but the applications can not sync? What's going on ?? Anyone knows?? Is the problem about the Itunes? Cos I am using Itunes 10.5...

I've tried both. First, I tried on my pc, where iTunes had installed iCloud when it last updated. I have iTunes installed on this computer (and on my iPad and iPhone), but that wasn't the issue.
So I went online, thinking I needed a separate iCloud Apple ID, but it prompted me for my current Apple ID and gave me the message about my ID being "valid" but not an iCloud account," which, lol, was what it had asked me to do in order to create one. I checked, and at least one other user is having the same issue. I'll attempt to copy/paste the Support request url: https://discussions.apple.com/thread/4430653?tstart=0
Thank you for any help you can give.
Trish

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