While most of us laugh at the fake virus scanning product ads and list of supposed viruses we have installed, less techie users simply read their computer is infected and they have to click here and download the program to fix it. If the malvertising is graphically similar to OS windows or security programs then they'll blithely run anything.
Just took a root kit off an XP laptop running IE. The owner admitted to simply believing the pop-up ads, downloading the software and ignoring warnings and then running it.
Against stupidity the gods themselves contend in vain
