Unable to update iphone 4 OS to 4.0.1

Hi,
Tried many unsucessfulattempts to update my iphone 4's OS to the latest 4.0.1 but each time after downloading the update (~30mins) the following message appears
"There was a problem downloading the software for the iphone. The network connection timeout. Make sure your network setting are correct and your network connection is active or try again later".
Operating a iTunes with Windows Vista Home Premium OS with a wired broadband connection. Can anyone advice on the solution to the above? what is correct settings? never had problem loading and updating other software (first time using the itunes to update an apple device)
Thanks

Sometimes firewall or anti-virus software can be the problem.
<http://support.apple.com/kb/TS3125>

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