What is Antivirus System Pro?
Antivirus System Pro (ASP) is a malware program that masquerades as an actual antivirus program. Like many of these malware infections, ASP sets itself up to run when you log into Windows and then goes about running a "virus scan" of your computer. It will then come up with hundreds and even thousands of different kinds of infections that it has "found." What makes this a dangerous program is that it will not remove any of these "threats" unless you have fully purchased the program.
The whole thing is a liar - there are no threats on your computer, other than Antivirus System Pro which is the true threat. Like other rogue programs, ASP will most likely shut down the tools that can not only stop it, but remove them as well: your true antivirus program, system restore, the task manager, and sometimes even MSConfig.
Why Do People Fall For This?
Antivirus System Pro and other types of this malware target those users who are new to using either a computer or that of the Internet. These individuals aren't technically savvy and may not know or completely understand the importance of having antivirus protection (such as not having any) or may not know the difference between a real and fake program. For new users or those who may not have experienced any type of issues before, having an "official" looking program tell you that viruses are running rampart in your system is startling.
And because we're continually using more and more technology to store information, documents, files, etc, it's easily to want to take the short path on getting rid of these viruses, even if it means shelling out $20 for the program. Unfortunately, it's this short path which gets people in trouble and why these types of things work. Even after a user "purchases" the program, it will still state a host of problems and worse, the person or people behind it now have your information, including your credit card number.