What is your "default language for non-Unicode" in your system settings? This kind of jibberish appears when the installer can't determine the system language properly and uses wrong characters. Check that and to be on teh safe side, set the same language as the installer package comes in.
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Oh, and yes, if you extract the 7z manually, simply run the setup.exe. It may suffer the same garbage text problem, though, so yo ustill need to fix that...