I got a new acer pc with Win7 64-bit and itunes download won't open, it says 'This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid win'

I've tried to download Itunes and itunes for 64-bit using mozilla firefox and internet explorer, even deleted the browsing history and closed and tried to dowload again and tried download quicktime separately, but nothing seems to work. 

Try right clicking on the installer and select run as administrator.

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