ITunes 9 download - invalid digital signature error with Windows 7 Ultimate

Since I have upgraded to Windows 7 Ultimate when I try and download the latest version of iTunes 9 I get Invalid Digital Signature error message. I've tried downloading with IE8, Opera and Firefox.
Help please!!

Perfect, thanks.
I see that one's got an SPI firewall:
http://www.netgear.co.uk/pdfs/dgn2000ds18july08
By way of experiment, try disabling the firewall and doing another iTunes download. Are you able to get a working installer this time?

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