Invalid SIM card after trying to update iPhone 4 software to iPhone 4S software

When I have tried to download the new iPhone 4S software my phone has said, "Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carrier's store to receive a replacement SIM card." This has happened to me two other times. I have never taken out my SIM cards, and have always followed all the directions to update to the new iPhone software. The apple store has always been really confused when I have brought my iPhone in to solve the problem of having an "invalid SIM card" and has consequently figured out that my SIM card and iPhone have both been "fried" by trying to update to the new software and have subsequently given me a brand new iPhone each time. This is a very frustrating problem with apple, and takes too much time to correct every time. Has anyone else experienced this problem?

Uninstatll iTunes.  Restart your computer.  Reinstall iTunes.

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