HT1926 Trying to download itunes update on my computer windows Xp... Tried 3 times and keep getting an error: invalid signature/will not be installed. HELP

iTunes is downloaded, been using it for years. I went to download an update and I keep getting an error.Error message is: invalid signature/will not install.
I did try to update manually as instructed however that also came with the same error.
If someone can advise it would be greatly appreciated.
So what is an invalid signature and how to fix it???

I would think the link doesn't work now as we are on version 10.7.
If you go to:
http://support.apple.com/downloads
the latest update for itunes is in the left hand column. If you follow the rest of the instructions from wiclee/fimeck it should work.
"Select "Save" instead of "Run". Once downloaded, right click the iTunesSetup.exe or iTunesSetup64.exe and select 'Run as Administrator' to install." (or use default)

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HT1926 Trying to download itunes update on my computer windows Xp... Tried 3 times and keep getting an error: invalid signature/will not be installed. HELP

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