Unable to update IOS 4.3.2 from IOS 4.3

Unable to update IPhone 4 version 4.3 to version 4.3.2 from itunes.
When I'm plug IPhone to PC, ITunes notification me whether want to update software.
I clicked 'Download and Update' option and it take 1~2 hours to download but when downloaded finish, it show error that unable to update.
When I try to replug in, it asked to redownload the update.
Can I know solution about it?

Try to download the firmware first and upgrade later as a second step.
Make sure that your security software allows contact to Apple servers during the upgrade process:http://support.apple.com/kb/TS3125

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