Unable to restore iPhone - Error 1603

Hi,
Used iTunes to update my iPhone 3Gs to the latest version and am currently stuck.
iPhone is in "ready to restore mode" (showing the connect to iTunes picture)
Am unable to restore the iPhone, when I press restore in iTunes, it prepares the device for restore, then after a while displays Error 1603.
I have tried restarting the computer, "hard restore" of my iPhone, reinstalling iTunes and also turning off my antivirus.
I have the latest version of iTunes installed and my operating system is up to date.
Appreciate any help as I am unable to receive any calls at the moment.
Cheers,
Brock

Thanks amy_lou.
I tried below steps as mentioned in link:
1) stop and start apple mobile service .
2)change administrator .
not sure which one worked but got my phone restored succesful .

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