There are been plenty of Free Antivirus in the internet that you can download but you never know how legitimate they are if you don't search and read reviews about them. There are some Free antivirus that are pretentious and fake. These are common and I'm sure you've seen ADS stating "Your PC is Infected by Virus, Click here for free scan" - don't be fooled by these. Think of it, how would they know if they haven't scan yet your computer? And even though you see some graphical scanning in progress, this ain't still legitimate.So before you download...