The infamous Conficker worm prevents an infected computer from accessing many anti-virus and security websites. (Some other malware does this as well.) At the end of this article is a link to a web page (“Conficker Eye Chart”) that uses this fact to simply tell you whether your computer might be infected or not.
When you go to this web page, your web browser will attempt to display the logos from 6 anti-virus and security sites. If you see all 6 logos (as illustrated above), your computer probably isn’t infected with Conficker.
If you click on the link below and you don’t see all 6 logos while connected to the Internet, either your computer is infected or there’s another reason (access to the anti-virus and security sites may be blocked by firewall, proxy, or router restrictions, etc.).
Test your computer: http://www.confickerworkinggroup.org/infection_test/cfeyechart.html