Hello Smith, Your personal AV and Firewall suite, F-Secure Internet Security 2014 for example, should keep you safe from unwanted content. However if you want to be absolutely certain that the installer is not tampered with, I suggest you download it from the manufacturers website, preferably over HTTPS. There are ways to check if the installer is legitimate, but it requires that the manufacturer provides MD5 or SHA1 (or similar) checksums on their public website (or somewhere, where you can easily obtain it from) so that you can compare the checksum derived from the installer to that of reported by the original manufacturer.
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