Infected File on the Online Download

When I downloaded SmartFTP today, there was an infected file that saide cannot clean, you should delete this file. If I do SmartFTP doesn't work. Everytime I open up SmartFTP I get the same window telling me about the infected file. I hit exclude, it closes. I reopen SmartFTP and it works. How can I fix this problem?

Try updating the antivirus program you use to the latest available.

The Online Setup installation is not infected, I can guarantee that