Step one: Stop cheering for a team that never wins anything.
Step two: Reinstall iTunes on your computer, make sure your Wifi connection is solid, try to download iOS 5 again.
Step three: Tell us if it doesn't work. There are literally dozens things that could be causing that error message, I'm guessing it's either a bad install of iTunes or a weak Internet connection.
Going into settings, general, reset, reset all settings on your phone before plugging it in wouldn't hurt either. Ideally you want everything running smoothly before doing software updates.
Hope that helps.
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