Antivirus setup closes by itself?

I downloaded avast free version. As i open the executable setup file, setup screen appears and after 2 - 5 seconds, it closes without any error or message :/ Then i tried Avira Antivir Personal (free), the same happens :( I can't install two of the best free antiviruses. I don't wanna use AVG. Can anyone help? Any help will be greatly appreciated!