May be we ever had an experience, when surfing in virtual world suddenly pop up raised on our computer screen that can not be eliminated. This pop up states that our computer got a virus, and to overcome them we must install an antivirus with a cost that has been determined. Be careful, because this is a fake antivirus. The virus is very disturbing, because in addition to spread quickly, it also has an interface similar to Microsoft's antivirus software, including Windows Defender, Microsoft Forefront, and Microsoft Security Essential.
With the lates up-date, this one is actually a Trojan that can be easily identified. One of the reliable virus detection is Dr. Web can be downloaded free at http://www.freedrweb.com/download+cureit/.
How do these fake antivirus work? First, he would pretend to check the PC, and report that your PC infected with many viruses, in order to look convincing, these fake antivirus software then offers improvement, on condition that we buy a license. Antivirus also has a safety net for they can not be uninstalled.
According to Ad Sap (Vaksin.com vaccine), clean up such a program is actually easy, we just turn off he internet connection from our PC, turn off system restore and run the program Dr.Web Cure-It. If possible, fix the PC registry by following the steps in http://vaksin.com/2010/1010/fakealert/fakealert.htm