Unable to install update iOS 5.1.1 iPad

I tried to update my iPad (first version) with iOS 5.1.1. It failed, and I received the following error message:  "Unable to Install Update - An error occurred installing iOS"
Now what?
Thanks in advance for any help you can offer.

What anti virus software is there for the iPad-1? Also where is the firewall located on the iPad, and how do I activate or disable it?

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