iTunes won't update phone

[Simon]

My girlfriends laptop running windows 7 won't update her iPhone 4 via iTunes.

It comes up with a message after 1-5 minutes saying network connection timed out.

Any help? Is it a firewall setting?

Thanks

 

[Elrein]

Download the ipsw file on another site, shift click in iTunes on update.... Locate the downloaded file and job done

Link ..... http://www.iphonefirmware.com/firmwares-download/