Here is a simple method to determine if your PC is infected with the Conficker Virus. The conficker virus will prevent a PC from accessing the security websites. Joe Stewart is the director of malware research at SecureWorks, and he has created a neat Web page that instantly and visually tells you if you’re likely to be infected by the Conficker worm.
http://www.joestewart.org/cfeyechart.html
Simple. Very nice.
