Upgrade iphone 3G from 3.1.2 to 4.2 stuck on back up

Hi
I am trying to upgrade my iphone 3G from version 3.2.1 to 4.2 using itunes v10.1. The software has downloaded fine, but when upgrading, itunes gets stuck on 'Backing up "zzzzzzz" iphone' and nothing else happens.
Please help.
Ray

Update:
My own main problem is that my wife and I separated more than two years ago, whereupon I lost access to the Mac with which my phone had been synced. I've had no computer at all until recently, and just managed to retrieve an old backup of files, songs, etc. (moral: it was a very good thing to have several redundant backups, as only one of six survived long enough to use). So it was time to match the iPhone to the new computer.
I wanted to report that I did the following and it worked:
* Synced the iPhone 3G successfully, giving me a good backup.
* Attempted to update iPhone to 4.2. Got the error after a long wait, and then clicked through to skip the backup stage.
* iPhone OS successfully updated, but lost all my Apps except the default ones.It was essentially a stripped, new phone.
* Went through iTunes and deleted and re-downloaded apps that had somehow come in under my ex-wife's account. All were then under my own iTunes account.
* On my phone, in Settings, I turned restrictions ON, then OFF. Have no idea if this made any difference.
* Synced my iPhone. Everything was restored successfully. I lost no information at all. Settings and files associated with each App were there and not lost.
And now, my iPhone 3G is faster, has better battery life, and the SUPREMELY annoying buzzing that spoiled all my calls is gone. So here is one user who had a good experience with 4.2, though it took some hoop jumping to get there.

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