IPhone/iTunes backup error when updating to iOS 4.2

Just bought an Iphone 4 a few days ago and tried several times to update it to iOS 4.2.... it fails EVERY TIME when the iTunes tries to proceed the phone's backup. An error occur and closes the iTunes without updating the phone.
Such problem didn't happen when updating my iPad... really don't know how to skip this problem and finally update my iPhone properly.
*** Apple!?!?!?
PS. I already downloaded the iTunes again, tried to "restore" my iPhone but the same thing keeps happening...

i have iphone 3gs and this has just happened to me, just in the middle of restoring it now, dread to think whats been lost on it.

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