How do I fix the "Invalid Signature" problem?

I keep getting this error message everytime I try to update my software to 10.6.3. I've even tried the suggestion of a manual download and it still says the same thing. Does it make any difference to say that my iTunes and accompanying music are saved on an external hard drive? I've never had this issue before.

Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run". Once downloaded, double click the iTunessetup.exe or iTunessetup64.exe to install.

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