Updated iphone 4 to 4.2.1

I have just updated to 4.2.1 and now my phone is disabled,Error message 23 and it wont restore??? any advise??

Yes, i just have a picture of the charger and itunes on my handset, when i plug it into the pc it comes up on itunes saying itunes has detected an iphone in recovery mode, it must restore before it can be used, then i click restore a error message comes up

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