Problem in upgrading version. downloading perfectly but its not installing automattically

I have iphone 4 and version is 4.3.1(8G4). I want to upgrade it. When i can connect with ituens and i gave update. But once the update is finished and its not installing automatically and it says OK to disconnect. I did 2 times this. Please help me regarding this. how to upgrade it.

Again I have tried with this. the below msg is coming and I have given Download and update.
Its downloading perfectly but not installing. in left side coumn under device in itunes i am not finding any update button also. also i have read the link which you have given. its for the restore. any other way to do this.

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