I get an error message "unknown publisher" when I download quicktime 7.7 for windows 64bit

I am trying to download quicktime and I get an error message :unknown publisher". I am using windows 7 64-bit operating system. Can anyone help me?

Which I get. But clicking on that link you provided does not give you the option of choosing between 32 and 64 bit installers.
Yeah, that was certainly a 32-bit installer file being referred to in the other message, too. (The 64-bit installer file is called iTunes64Setup.exe.)
Just in case it's an issue with your normal browser not working properly with the system-detection equipment on the page (there's a javascript control that checks for operating system specifics, and is supposed to deliver the correct Mac or Windows installers), let's try a different web browser for the download. If you use Firefox instead of IE (or vice versa), do you get offered an iTunes64Setup.exe instead of an iTunesSetup.exe?

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Did you downloaded and installed Photoshop and Illustrator CS6 through Creative Cloud.
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Serac wrote:
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I get an error message "unknown publisher" when I download quicktime 7.7 for windows 64bit

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