Cant download itunes update dur to Unknown Publisher - please help!!!

Please help me I don't know what to do next. When I try to update itunes it downloads but then comes up with a message telling me download failed due to unknown publisher. I tries following advice from another post but this didn't work.
Thanks in advance
PS also cannot download new iphone software but i will post that in the iphone section ...

Thanks that worked - do you know why that is?
excellent news, Jay.
We (the one's of us who are troubleshoting the error) think it's something to do (in some cases) with the network settings on certain kinds of network setups (possibly if you're connecting to a LAN which has an internet gateway, rather than, say, connecting wirelessly to a router plugged into a DSL or Cable modem. Bloody Yeti discusses that in this post:
http://discussions.apple.com/message.jspa?messageID=10547579#10547579
Off in a different thread (I've just discovered) Bloody Yeti was also simultaneously discussing trouble with recovery mode, so plausibly the two issues (getting the ipod software and getting the iTunes installer) are connected:
http://discussions.apple.com/message.jspa?messageID=10448430#10448430

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Cant download itunes update dur to Unknown Publisher - please help!!!

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