Unable to update my iphone 4 to iOS 4.0.1

I tried updating my iphone4 and its giving the following errro. "iTunes could not backup 'ipone name' because of an unknown error. Can anyone pls help ? I am in UK with O2. I have lots of time singal lost error inside my home and some places outside too.
Mine is still on iOS 4.0

i will try this tonight, http://discussions.apple.com/message.jspa?messageID=11936947#11936947
I am running windows 7 32 bit. I have disabled firewall etc to check if thats an issue. Phone is already in sync, not sure if there is a way we can upgrade without asking to take backup again.

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