Trying to update my iPad 2 to iOS 5 but it keeps failing.

I have been trying to update my iPad 2 to iOS 5 but it keeps coming up with "The iPad could not be restored. An unknow error occurred (-1)". I've been trying since Thursday but still no joy. I've tried doing it through two different PCs as well. My iPad just tells me that it needs to connect to iTunes. I updated my iPhone software with out any issues.
I went into my local iStore but they wanted £12.00 just to restore it. I was advised that they would do it for free in an Apple Store so I'm guessing that I'll have to pop into one in London during the week.
Is anyone else having these problems / been able to resolve it?

Are you trying to update via wifi or connected to your computer?
 Cheers, Tom

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