If you want to avoid getting infected with virus while downloading from the internet, you just change the extention of the file at the download dialogue. At the download dialogue we are presented with a screen showing where to save the downloaded file, at that point, there will be an arrow where you can change "zipe file", "application files" to "all files". Give an extension like zipex. when you want to use the file, download it to your computer, which I suppose is not infected, and change the extension to exe or zip. I have found that viruses are programmed to affect certain types of files only. Of course I am assuming that you will download files from trusted sources only. This tips has saved me from many potential viruses.