ITunes won't detect firmware 4.3.3 for iPhone 3GS

I've read about the problem where it doesn't download it and you have to turn off the firewall etc. However my problem is that it just won't detect it at all. I check for updates and it says that my iphone is update to date which is running on a 4.2.1. I even tried to manualy do by downloading the firmware and going into recovery mode on the phone and shift clicking restore but then it says that the firmware is not compatible with my phone.
The phone is an iPhone 3GS not jailbroken running on 4.2.1.
Running Windows 7 64bit.
I have the most recent version of iTunes.
I did the whole virus protection being off, firewall off and changing the host file thing.
Nothing seems to work and I'm not sure what else to do here. I thought perhaps the 4.3.3 firmware wasn't for the 3GS but reading about it seems it is so I'm not sure why iTunes won't detect it.

Try getting it from here
http://osxdaily.com/2011/05/04/ios-4-3-3-download/
Download the version for your phone, then connect the phone to iTunes and hold SHIFT while clicking Check for Updates. You can then install the file you downloaded above.

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ITunes won't detect firmware 4.3.3 for iPhone 3GS

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