Get VirusTotalScanner Portable Free. Thisis the tool that you can make use of to ascertain that the files you are downloading would not cause any harm to your computer. The tool can only be used when you have an internet connection. Once you have downloaded a new file, you will have to select it and then scan it. The scan will detect if any virus, malware, Trojans or spyware are hidden in the file. By using this tool, you can make it certain that no vicious virus gains entry into your system and catches you unaware.