For Windows XP. trying to download 10.5.2, but download fails continuously with message saying "certificate has invalid signature"

I have been trying to download itunes_10.5.2 to a Window XP environment, but on each occasion after each section of the download I get a fail message saying something like "certificate has invalid signature".

Thanks for the reply kglad - much appreciated.
I have already tried that option (along with downloading files) as it was one of the solutions mentioned on other threads, but that also failed.
Any other ideas?

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