This is a standard MS Windows error that says your user account does not have permissions to the file or the file location. It is also possible that it is on some network location/corrupt.
I would try to re-download it, and make sure you get it from our website. Also make sure you are logged into Windows with an account that has admin privileges. You can always right-click on the exe, and check the file permissions, choose to run it as administrator, etc.
You could also try disabling any third-party security software that may be blocking the program, what "security system" ?
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