Cannot install itunes - message "unknown publisher & no digital signature

I have been using itunes for ages but on Tuesday when i tried to update my IPOD it froze so i then checked that i had the most up date itunes by downlading the latest version which i have done loads of times without any problem. THis time however every time it downloaded it came up with the error message "unknown publisher" and "no digital signature". It gave the option of running the program still but then it would just close and not do anything!!
I have been to the apple shop and my ipod has been sorted although everything has been wiped as they had to restore it. I have again today tried to download itunes but am still getting the same message so cannot put music back onto my ipod to use!!
I use windows vista and have an ipod touch. We hav also tried another computer but are still having the same problem. Any ideas??
Thanks
Caz

Should I just get the itunes setup folder from a person that has got it already?
Yes, that usually works. (So long as we can get an undamaged installer onto the PC with one of these, it will usually install fine.)
Another thing that is worth a try is seeing if you can connect to a different wireless network, and downloading the installer while you're connected to the internet that way. (The wireless router being grumpy is a common cause of this sort of thing, so by connecting to a different network you're taking the grumpy router out of the equation.)

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        /passive
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            n - No UI
            b - Basic UI
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    Message was edited by: Vistacrap
    Message was edited by: Vistacrap
    null

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